# Index stat for map sizes

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Last response: in Video Games

Anonymous

April 1, 2005 9:35:45 AM

Archived from groups: alt.games.vgaplanets4 (More info?)

At most hostsites there's a pool of maps to choose from for playing.

Usually they are described with the planet count and the rough size of

the galaxy (given in coordinate cornerpoints).

I would like another number or two added to the map descriptions for a

better overview. Something like planet density. To get an idea how far

I have to travel to get from planet to planet. I believe this to be a

very important statistic (beside size and planet count) to judge the

map on its playability, and if warp or hyp engines will be of advantage

(generally speaking).

It could be something simple like planet density:

p=P/A

p: planet density

P: number of Planets

A: area of galaxy

With area as simple as (length)^2 for squares or pi*(radius)^2 for

circles.

p^(-1) would be something like 'space around each planet', and you

could derive a mean distance d between planets from it:

d=2*sqr((pi*p)^(-1))

I know of course that such a description by numbers would be very

general. Some maps have a varying density, some have clusters, and so

forth. But it would at least give a general idea and a better feeling

for a map you have not seen before. And a look at the map (and its

planet distribution) will provide a quick evaluation of the credibility

of the statistics p and d.

To give a few examples:

Echo Cluster (500 planets, 2000 x 2000 square)

p=1.25*10^(-4)

d=101

Blitzkrieg (220 planets, 400 radius circle)

p=4.38*10^(-4)

d=54

YaleLite (252 planets, 2000 radius circle)

p=0.2*10^(-4)

d=252

I think these examples already give a feeling for each (very different)

map, and if you'd want to play a non-hyp race in it. Something I

don't easily get just from a look at the coordinate points or even a

picture (without scale) of the map.

What I want to know now is, would there be enough of a popular demand

for such stats like 'planet density' and 'mean distance' to

convince the map creators and the hostsite administrators to add these

stats to the map descriptions?

At most hostsites there's a pool of maps to choose from for playing.

Usually they are described with the planet count and the rough size of

the galaxy (given in coordinate cornerpoints).

I would like another number or two added to the map descriptions for a

better overview. Something like planet density. To get an idea how far

I have to travel to get from planet to planet. I believe this to be a

very important statistic (beside size and planet count) to judge the

map on its playability, and if warp or hyp engines will be of advantage

(generally speaking).

It could be something simple like planet density:

p=P/A

p: planet density

P: number of Planets

A: area of galaxy

With area as simple as (length)^2 for squares or pi*(radius)^2 for

circles.

p^(-1) would be something like 'space around each planet', and you

could derive a mean distance d between planets from it:

d=2*sqr((pi*p)^(-1))

I know of course that such a description by numbers would be very

general. Some maps have a varying density, some have clusters, and so

forth. But it would at least give a general idea and a better feeling

for a map you have not seen before. And a look at the map (and its

planet distribution) will provide a quick evaluation of the credibility

of the statistics p and d.

To give a few examples:

Echo Cluster (500 planets, 2000 x 2000 square)

p=1.25*10^(-4)

d=101

Blitzkrieg (220 planets, 400 radius circle)

p=4.38*10^(-4)

d=54

YaleLite (252 planets, 2000 radius circle)

p=0.2*10^(-4)

d=252

I think these examples already give a feeling for each (very different)

map, and if you'd want to play a non-hyp race in it. Something I

don't easily get just from a look at the coordinate points or even a

picture (without scale) of the map.

What I want to know now is, would there be enough of a popular demand

for such stats like 'planet density' and 'mean distance' to

convince the map creators and the hostsite administrators to add these

stats to the map descriptions?

More about : index stat map sizes

Anonymous

April 4, 2005 11:44:04 AM

I'd love to see this.

Greg Bahr

P.S. This is a result of our discussion isn't it?

Anonymous

April 4, 2005 2:31:58 PM

"Lord Owl" <lord.owl@gmx.de> schrieb im Newsbeitrag news:1112362545.660292.48050@l41g2000cwc.googlegroups.com...

> forth. But it would at least give a general idea and a better feeling

> for a map you have not seen before. And a look at the map (and its

Extend the description and give minimum, maximum, mean and volatility for each map.

GFM GToeroe

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Anonymous

April 8, 2005 11:24:49 PM

Owl

Could you state your formulae in more exact maths? If the group could

agree a programmatic formula then this could be coded from a cut-down

version of map2ps fairly swiftly. Site admins could then run this over

..MAP files when they install them. New maps would be easily handled.

Indeed maybe I could make map2ps throw off some metrics as a side effect.

Lord Owl wrote:

> At most hostsites there's a pool of maps to choose from for playing.

> Usually they are described with the planet count and the rough size of

> the galaxy (given in coordinate cornerpoints).

> I would like another number or two added to the map descriptions for a

> better overview. Something like planet density. To get an idea how far

> I have to travel to get from planet to planet. I believe this to be a

> very important statistic (beside size and planet count) to judge the

> map on its playability, and if warp or hyp engines will be of advantage

> (generally speaking).

>

> It could be something simple like planet density:

>

> p=P/A

>

> p: planet density

> P: number of Planets

> A: area of galaxy

>

> With area as simple as (length)^2 for squares or pi*(radius)^2 for

> circles.

>

> p^(-1) would be something like 'space around each planet', and you

> could derive a mean distance d between planets from it:

>

> d=2*sqr((pi*p)^(-1))

>

> I know of course that such a description by numbers would be very

> general. Some maps have a varying density, some have clusters, and so

> forth. But it would at least give a general idea and a better feeling

> for a map you have not seen before. And a look at the map (and its

> planet distribution) will provide a quick evaluation of the credibility

> of the statistics p and d.

>

> To give a few examples:

>

> Echo Cluster (500 planets, 2000 x 2000 square)

> p=1.25*10^(-4)

> d=101

>

> Blitzkrieg (220 planets, 400 radius circle)

> p=4.38*10^(-4)

> d=54

>

> YaleLite (252 planets, 2000 radius circle)

> p=0.2*10^(-4)

> d=252

>

> I think these examples already give a feeling for each (very different)

> map, and if you'd want to play a non-hyp race in it. Something I

> don't easily get just from a look at the coordinate points or even a

> picture (without scale) of the map.

>

> What I want to know now is, would there be enough of a popular demand

> for such stats like 'planet density' and 'mean distance' to

> convince the map creators and the hostsite administrators to add these

> stats to the map descriptions?

>

Anonymous

April 11, 2005 12:53:33 AM

Lord Owl asks

>What I want to know now is, would there be enough of a popular demand

>for such stats like 'planet density' and 'mean distance' to

>convince the map creators and the hostsite administrators to add these

>stats to the map descriptions?

Mean distance would be interesting to me. Because I would understand it.

Mentioning this is a good idea.

Density would not be meaningful to me. It is not a very intuitive

concept to convey for maps - to me, anyway. It would be a number which I

would ignore.

--

Paul Honigmann

Anonymous

April 11, 2005 1:41:40 PM

The planet density is quite straightforward. Determine the area of the

map by the given coordinates of its cornerpoints, i.e. A=(length)^2.

Or, if it is a circle, take half a side as radius R and determine the

area with pi*R^2. Divide the planet number through the total area, and

you got some kind of planet density.

As Paul mentioned below it is something of an abstract value.

But if you take its reciprocal you get something like average space per

planet. Imagine a circular area of space of that amount, with the

planet in its center. Average distance from planet to planet would be

twice the radius r of such a 'planet-space' circle. To get the

radius, solve a=pi*r^2.

A: Area of map

P: number of planets

a: space per planet

d: average distance between planets

a=A/P, a=pi*r^2

d=2r=2*sqr(A/(pi*P))

I am not sure how close this value approximates the real average

distance between neighbouring planets on a map. Mathematically it

appears to be sound. Depends a lot on the individual map and its

homogenity. At the very least it gives you a rough idea .

Anonymous

April 11, 2005 11:23:07 PM

Mean distance is more intuitive for me also. One could take a given

planet and calculate the mean distance to all other planets. This could

approximate to something that tells me how a given race would fare in

running a transport network.

Map forms do matter though. A clustered map would behave very

differently than one blob (like Echo). The two cluster extended Yale

would get a weird metric.

I can only think to produce a set of mini values based on local mean

distances using randomly selected planets. Then take the mean and

std-deviation of the set of figures.

KlingonKommand wrote:

> Lord Owl asks

>

>> What I want to know now is, would there be enough of a popular demand

>> for such stats like 'planet density' and 'mean distance' to

>> convince the map creators and the hostsite administrators to add these

>> stats to the map descriptions?

>

>

> Mean distance would be interesting to me. Because I would understand it.

> Mentioning this is a good idea.

>

> Density would not be meaningful to me. It is not a very intuitive

> concept to convey for maps - to me, anyway. It would be a number which I

> would ignore.

Roger

April 12, 2005 6:50:19 PM

I'm not playing VGAP much any more, but this is such an interesting

problem to work on that I couldn't resist

I came up with two statistics that I think do a pretty good job of

describing:

1) How close planets are on average

2) How big the area is between clusters of planets

I call these measurements the "Median Distance Index" (measured in

lightyears) and the "Boonies Index" (how likely you are to end up "out

in the boonies").

Before explaining how I arrived at these numbers, take a look at my

results (if this doesn't show up formatted correctly, try using a

fixed-width font. Google's newsgroup reader has a link near the top to

switch to Fixed-width):

Map Stars Med Dist Boonies Index

============================================

Yale 1009 67.36 3.24

Echo 500 60.90 0.17

Epsilon 688 44.18 11.30

Stardrift 592 44.15 3.58

dblossom 400 38.21 2.36

Snowflake 40 100.00 3.76

Yalelite 252 139.32 2.55

QuadraStar 2001 40.01 1.44

Starburst 420 55.47 36.25

Phi 500 50.01 3.31

To compute these figures, the map file is loaded and then a Minimum

Spanning Tree is constructed from the starmap. The "Median Distance

Index" is defined as the median edge length of the tree. The "Boonies

Index" is defined as the difference between the mean and the median

edge length.

The "median Distance Index" tells you about how far apart, in

lightyears, you can expect planets to be.

A high "Boonies Index" indicates that there are groups of stars which

are relatively isolated. For example, the Starburst galaxy - which

consists of several clusters of planets separated by a large distance -

has the highest Boonies Index.

Of course, to compute how "warp-friendly" any map is, you'll also need

to take into account the number of stars, and the overall size... but

that information is readily available.

Roger

April 13, 2005 12:16:10 AM

Visual aid now available. See pictures of the Minimum Spanning Trees

for various galaxies:

http://webpages.charter.net/kgnorris/spanningtrees.png

Anonymous

April 13, 2005 8:22:20 AM

Wow! That's the difference you get when someone experienced in

statistics and programming takes care of a problem . Very elegant

approach. I dimly remember something vaguely like it from a statistical

mechanics lecture. Love the pictures .

I notice that your average distance is only about 60% of the amount I

get with my own rather simple method. Hm. I believe the Minimum

Spanning Tree appears to compute more something like 'average

distance to the closest planet' than 'average distance to all

neighbouring planets'. At least in tendency.

Concerning the Boonies Index, what do you understand under "the

difference between the mean and the median edge length"? It's

probably a language thing. I assume 'mean edge length' is the

average length of a single tree line (make the sum and divide it

through number of lines), while 'median edge length' is computed

by, hm, sorting out the extreme ones until you are left with the last

one right in the middle?

Anonymous

April 14, 2005 1:50:08 AM

Roger writes

>Visual aid now available. See pictures of the Minimum Spanning Trees

>for various galaxies:

>

>http://webpages.charter.net/kgnorris/spanningtrees.png

Very pretty!

--

Paul Honigmann

Roger

April 14, 2005 1:12:08 PM

Yes, your understanding of mean and median is correct.

I did a little more number crunching based on some other types of

trees, to see if those numbers are helpful in any way. I'm not going

to try to format these.... import it into Excel if you want to view

them properly

Map Info,,Minimum Spanning Tree,,,Maximum Spanning Tree,,,Lattice,,,

Map,Stars,Median,Mean,Diff,Median,Mean,Diff,Median,Mean,Diff

dblossom,400,38.21,40.57,2.36,102.84,122.74,19.90,66.24,80.72,14.48

Phi,500,50.01,53.32,3.31,106.94,124.36,17.42,77.32,88.47,11.15

Epsilon,688,44.18,55.48,11.30,102.18,165.30,63.12,70.18,108.63,38.45

Stardrift,592,44.15,47.73,3.58,137.59,170.02,32.43,75.29,107.91,32.62

Echo,500,60.90,61.07,0.17,142.47,165.39,22.92,101.08,112.42,11.34

Yale,1009,67.36,70.60,3.24,160.12,175.96,15.84,111.51,123.34,11.83

Starburst,420,55.47,91.72,36.25,383.44,438.23,54.79,115.26,234.69,119.43

Snowflake,40,100.00,103.76,3.76,202.00,231.39,29.39,158.11,164.58,6.47

Yalelite,252,139.32,141.87,2.55,340.65,357.90,17.25,219.64,248.65,29.01

"Minimum Spanning Tree" - Already described.

"Maximum Spanning Tree" - I don't think this is a real term... but it's

basically the opposite of the minimum spanning tree. Only edges

between neighboring stars are eligible.

"Lattice" - Connects all stars with their neighbors. Stars are

considered to be "neighbors" if the line between them cannot be cut by

a shorter line between other stars.

I may post additional visual aids when I get the chance.

Anonymous

April 16, 2005 11:59:59 PM

Roger, well done. This is just what was asking for. Someone with

original ideas and maths skill to write them up cogently. The number

crunching is a bonus and your numbers give good quick appreciation of

map character. Comparing my own Yale and Yalelite we see the increase in

median distance in the thinned out map (making it better for the EE) yet

the Boonies index is of the same order of magnitude, indicating the

underlying map stats. Echo with Boonies 0.17 is obviously a totally

"urban" map.

I think you have the last word on this. Will you post a list of all maps

at Drew's for inclusion on his site?

Everyone else, just stand back in awe for a few minutes.

Roger wrote:

> I'm not playing VGAP much any more, but this is such an interesting

> problem to work on that I couldn't resist

>

> I came up with two statistics that I think do a pretty good job of

> describing:

> 1) How close planets are on average

> 2) How big the area is between clusters of planets

>

> I call these measurements the "Median Distance Index" (measured in

> lightyears) and the "Boonies Index" (how likely you are to end up "out

> in the boonies").

>

> Before explaining how I arrived at these numbers, take a look at my

> results (if this doesn't show up formatted correctly, try using a

> fixed-width font. Google's newsgroup reader has a link near the top to

> switch to Fixed-width):

>

> Map Stars Med Dist Boonies Index

> ============================================

> Yale 1009 67.36 3.24

> Echo 500 60.90 0.17

> Epsilon 688 44.18 11.30

> Stardrift 592 44.15 3.58

> dblossom 400 38.21 2.36

> Snowflake 40 100.00 3.76

> Yalelite 252 139.32 2.55

> QuadraStar 2001 40.01 1.44

> Starburst 420 55.47 36.25

> Phi 500 50.01 3.31

>

> To compute these figures, the map file is loaded and then a Minimum

> Spanning Tree is constructed from the starmap. The "Median Distance

> Index" is defined as the median edge length of the tree. The "Boonies

> Index" is defined as the difference between the mean and the median

> edge length.

>

> The "median Distance Index" tells you about how far apart, in

> lightyears, you can expect planets to be.

>

> A high "Boonies Index" indicates that there are groups of stars which

> are relatively isolated. For example, the Starburst galaxy - which

> consists of several clusters of planets separated by a large distance -

> has the highest Boonies Index.

>

> Of course, to compute how "warp-friendly" any map is, you'll also need

> to take into account the number of stars, and the overall size... but

> that information is readily available.

>

Anonymous

April 17, 2005 1:45:52 AM

Roger writes

>400,38.21,40.57,2.36,102.84,122.74,19.90,66.24,80.72,14.48

>Phi,500,50.01,53.32,3.31,106.94,124.36,17.42,77.32,88.47,11.15

>Epsilon,688,44.18,55.48,11.30,102.18,165.30,63.12,70.18,108.63,38.45

>Stardrift,592,44.15,47.73,3.58,137.59,170.02,32.43,75.29,107.91,32.62

>Echo,500,60.90,61.07,0.17,142.47,165.39,22.92,101.08,112.42,11.34

>Yale,1009,67.36,70.60,3.24,160.12,175.96,15.84,111.51,123.34,11.83

>Starburst,420,55.47,91.72,36.25,383.44,438.23,54.79,115.26,234.69,119.43

>Snowflake,40,100.00,103.76,3.76,202.00,231.39,29.39,158.11,164.58,6.47

>Yalelite,252,139.32,141.87,2.55,340.65,357.90,17.25,219.64,248.65,29.01

Clear, concise, and self-explanatory. It reminds me of Jon Nunn's

classic "111011" post or Peter Chamber's proof that 2 = 1 on Tuesdays.

Of course in my day we didn't have 1's, we just had zeroes. We need more

postings like this. Perhaps we can change the name of the NG to

alt.games.vgaplanets4.binaries ...

--

Paul Honigmann

Roger

April 17, 2005 11:45:57 PM

I'll see what I can do. It'll probably be a few days before I can

scrounge up enough free time to get to all the maps, but I'll post the

link when I finish.

Roger

April 20, 2005 4:54:28 PM

The final results are in!

I didn't actually get to *all* of the maps on Drewhead's, but I think I

covered most of them. And after further analysis, I decided that

Minimum Spanning Trees, while visually appealing, really aren't all

that useful

Read the full report (follow map links for pictures) here:

http://webpages.charter.net/kgnorris/maps/mapinfo.htm

I decided on a different method for calculating the Boonies Index.

First of all, I'm just using the basic lattice instead of the minimum

spanning tree. (i.e., we're considering all connections between each

planet and its neighbors). The Boonies Index is now defined as the

average deviation divided by the median.

Based on the median and the Boonies Index, I determined an overall

"Warp Unfriendliness" factor. Should be fairly self-explanatory on the

results page.

Hope this info is useful!

Roger

April 20, 2005 7:03:39 PM

Whoops, I missed more than a few maps on my first pass... I've updated

the list with several additions.

Anonymous

April 21, 2005 8:06:17 AM

Dear newsgroup.

As L.O. started this thread I was anxious to see the results as it

could mean that the world of p4 maps finally would get some

"clarifying".

I did the nOob test with Rogers table today and guess what happend!

I tested it with two objects. Both beginners to intermediate (1-2 games

played). BOTH of them had absolutley no clue at all what this site was

telling them.

--> idea: great

--> concept: great

--> result: not usefull at all!

Fabian

Anonymous

April 21, 2005 8:43:31 AM

8-)

Ok - good point!

So the facts are there we just need to find a way to show 'em in a

manner that is easily accessible (even for new players).

Fabian

Roger

April 21, 2005 10:16:20 AM

Some simple descriptions for newbies (I'll add this to the site when I

get the chance):

First of all, newbies will probably only care about the first five

columns or so. Everything after that is for the engineer-types who

like to stare at pages full of numbers. So, here are those first five

columns:

1) Map Name

Self explanatory

2) Stars

The number of stars in the map.

3) Overall Warp Unfriendliness

This number attempts to describe how warp-drive races will fare on the

map. It's really not useful for anything accept comparing two maps to

see which one is more warp-friendly.

For example, we can see from the list that Troubadour appears to be the

friendliest map for warp-drive races.

A more technical explanation is that this number takes into account

both the median distance between stars and their neighbors, as well as

whether stars are evenly distributed across the map.

4) Boonies Index

This number describes whether stars are evenly distributed or not. A

high "Boonies Index" indicates that you're more likely to end up "out

in the boonies." More specifically, maps with a high Boonies Index

will tend to have dense clusters of stars separated by large gulfs of

empty space.

A map with all the stars evenly distributed, so that each star is about

the same distance from all of its neighbors, would have a very low

Boonies Index.

In our chart, anything with a Boonies Index larger than about 0.7 is

going to have fairly major "clustering" of stars, or large gulfs of

empty space.

5) Lattice Median (measured in lightyears)

The lattice median is just the median distance beween neighboring

stars. The median, for those who aren't statistics buffs, is just the

middle value. For example, a lattice median of 120 indicates that most

stars are about 120 lightyears away from their neighbors.

Obviously, this is a very important value to consider when choosing a

map, since it tells you how difficult it will be for warp-drive ships

to get to their neighboring stars.

Anonymous

April 21, 2005 10:40:19 AM

Just wanted to say that I appreciate your work very much! Please

proceed!!

Fabian

Roger

April 21, 2005 4:58:50 PM

> We see the Boonies index for these two is 0.49 and 0.50. Is > this

what we expect?

Yes. The Boonies Index only takes into account the evenness of the

distribution. Yale and Yalelite have basically the same distribution,

so the number is virtually the same. As you said, even though Yalelite

has a lower planet density, the "clustering" is about the same. So...

perhaps the Boonies Index should be renamed to the Cluster Index or

something like that?

A better measurement of planet density is the Median calculation, which

measures the median distance between neighboring stars.

Only the the "Overall Warp Unfriendliness" number takes into account

both density and clustering. And, if you look at the results, Yale

scores considerably better in that area than Yalelite, due to its

greater planet density.

Anonymous

April 21, 2005 5:12:29 PM

All that is needed is a short explanation.

This great-idea-but-I-am-too-dumb-to-learn-to-understand-it-attitude is

nothing for VGAP players anyway.

Lordfire

"Fabian" <fabs42@yahoo.com> wrote in message

news:1114081577.411415.67770@z14g2000cwz.googlegroups.com...

>

> Dear newsgroup.

>

> As L.O. started this thread I was anxious to see the results as it

> could mean that the world of p4 maps finally would get some

> "clarifying".

>

> I did the nOob test with Rogers table today and guess what happend!

>

> I tested it with two objects. Both beginners to intermediate (1-2 games

> played). BOTH of them had absolutley no clue at all what this site was

> telling them.

>

> --> idea: great

> --> concept: great

> --> result: not usefull at all!

>

> Fabian

>

Anonymous

April 22, 2005 12:13:30 AM

An interesting test of Boonies indexis the pair { Yale, Yalelight }.

Yalelight is a sub-set of 25% of the stars in Yale, randomly chosen.

So the overall stats of the stars distribution should only differ in

terms of density. Not angular distribution or the like.

We see the Boonies index for these two is 0.49 and 0.50. Is this what we

expect? Stars in Yalelite are certainly in a lower density cluster. One

is in sense in a more rural locale. However the 'clustering' is

certainly about the same.

Perhaps the term 'Boonies Index' is merely somewhat mis-named?

Roger wrote:

> The final results are in!

>

> I didn't actually get to *all* of the maps on Drewhead's, but I think I

> covered most of them. And after further analysis, I decided that

> Minimum Spanning Trees, while visually appealing, really aren't all

> that useful

>

> Read the full report (follow map links for pictures) here:

> http://webpages.charter.net/kgnorris/maps/mapinfo.htm

>

> I decided on a different method for calculating the Boonies Index.

> First of all, I'm just using the basic lattice instead of the minimum

> spanning tree. (i.e., we're considering all connections between each

> planet and its neighbors). The Boonies Index is now defined as the

> average deviation divided by the median.

>

> Based on the median and the Boonies Index, I determined an overall

> "Warp Unfriendliness" factor. Should be fairly self-explanatory on the

> results page.

>

> Hope this info is useful!

>

Anonymous

April 24, 2005 10:53:27 PM

"Clustering Index" I would support.

Roger wrote:

>>We see the Boonies index for these two is 0.49 and 0.50. Is > this

>

> what we expect?

>

> Yes. The Boonies Index only takes into account the evenness of the

> distribution. Yale and Yalelite have basically the same distribution,

> so the number is virtually the same. As you said, even though Yalelite

> has a lower planet density, the "clustering" is about the same. So...

> perhaps the Boonies Index should be renamed to the Cluster Index or

> something like that?

>

> A better measurement of planet density is the Median calculation, which

> measures the median distance between neighboring stars.

>

> Only the the "Overall Warp Unfriendliness" number takes into account

> both density and clustering. And, if you look at the results, Yale

> scores considerably better in that area than Yalelite, due to its

> greater planet density.

>

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