How did you categorized your STEAM Library?

action
rpg
rts
...
achivements
trading cards
100% (achivements)

• Finished
• Gifts
• Absolutely shitty games
• Everything else :P

Games are grouped into:

• Backlog
• Done
• Will not play

Those groups are accompanied by:

• List of favorites that I currently play (or played recently and plan to come back to them sooner or later)
• Commonly used Steam filter "Installed" to browse those which I can play right away

1 - Fav
2 - Later
3 - Useless (Hidden)

A-List: Games I've got installed and currently play.
Action
Adventure
Strategy
Undecided: Games I'll try out at some point but not on high priority.
Upgrade: My computer is too weak to play these... :'(
Valued: Games I've finished, enjoyed, and don't think I'll play again in the near future.
Waste: All the crap I didn't like or won't ever play.

i put Serious Sam/DNF/Painkiller/Doom into a category "DOOM LIKE" and just leave the others.
and i think there is a software can sort gamecategory easier, i cant think the name now, u may google it.

https://www.dropbox.com/s/j8qw5k3ul5oub50/Steam.png

Genres
+
Beta
Done (100%)
Grinding (missing some achievements)
No Achievements
Broken Achievements

I'm a simple kind of person

I have:

• Finished (like a hall of fame of completed games)
• Finished/Replayable (you saw through the story but they have replay value)
• Priority 1 (what I'm playing right now)
• Priority 2 (the place to go if I'm not especially in the mood of playing things in P1)
• Priority 3 (I might play them once the backlog from P1/P2 gets lighter)
• Not interested (very bad or a genre that I dislike)

Then the rest of super-awful games are hidden.

Alphabetic order ....

On genre but it's a work in progress. Alot of times a game can fit in 2 or 3 genre's, like action or indie, so trying to melt some genre's together unless it has 1 single distinct genre. But sometime it seems easier to just put everything in 1 folder again.

I was about to say if you have over ~100 games it's worth creating categories as it's gets difficult to find things. But you have over 1,000 games!? How do you ever find the games you want to play in one huge list!? XD

If you do it by genre it gets a bit messy (especially with so many games), so I recommend having only a handful of categories

I try to keep it simple:

Classics
Reserved for my absolute favourite games

In Progress
Games I'm currently playing

To Complete
Games on my list to complete.

Completed
Games I have completed (they weren't good enough to be placed in 'Classics')

Wasteland
Games I wish I didn't own get put in here. Reserved for the games I never, ever want to play.

Multiplayer Only
Games that only have multiplayer game modes (TF2, CSS, etc)

I find that keeps my library nice and organised. I highly recommend doing it. I don't know how I managed before tbh

2 categories:

Meh
Not Meh

YOU CAN CATEGORIZE GAMES IN STEAM?!
Grüße zurück!

I order them by the source I got them from. Call me crazy, but I kind of want where my games came from.

View attached image.

http://imgur.com/3YUu4gf

skin is Metro For Steam

I also hide all shitty games

1. Skyrim
2. Non-Skyrim

Of course by game type. It's the best because it gives you the absolute biggest number of categories, so each category will have less games than in any other situation. That's the whole effing point of categorizing. I, for instance have 21 categories in my Steam library: 2D sidescrollers, action games, action-adventure, action-rpg, action-stealth, arcade, card games, casual, fighting, FPS, MOBA, platformers, puzzle games, RPG, RTS, RTS-RPG, simulators, strategy, survival-horror, TBS-RPG, and tower-defense. The biggest of my categories, which is of course FPS has just 98 games out of 418. It sure beats having a category with less than 50 games and another one with the rest, don't you think?

By games' series

You can try this tool if you want Click

By genres (shooter, rpg, racing, etc), same genres but with Finished tag, Free to Play, Indie (all that free, unsorted indie crap).

I'm copying and pasting this directly from another thread.

I'm a little obsessive. Here are my categories:
Section 1 is based on current achievement status.
1A: Completed
1B: Clean up (Games that I have a few achievements left, but can be time consuming or annoying to get)
1C: In progress
1D: Multiplayer (Games I will probably never complete due to multiplayer achievements)

Section 2 is the backlog.
2A: Tier 1
2B: Tier 2
2C: Tier 3
2D: Tier 4
2E: Nope

Section 3 refers to Steam ratings.
3A: Overwhelmingly Positive
3B: Very Positive
3C: Mostly Positive
3D: Positive
3E: Mixed
3F: Negative
3G: Mostly Negative
3H: Very Negative
3I: Overwhelmingly Negative

Section 4 Whether or not the game has achievements.
4A: Achievements
4B: No Achievements

The categories that describe the game best are the categories I put them in for example: FEAR --> Shooter / Horror. THIEF --> Action / Stealth.
Shame Steam doesn't have some sort of auto-sort option though, shouldn't be too hard to implement.

Junk
Favorites
Others

i don't have as many games as some of the users here though,so 3 categorize works fine for me.

Favorites
Multi-player
Completed (For having beat story and dlc [if any])
Completion (for 100 % achievements)
and after that I let the list go on and I'm usually under installed so I know what I'm currently playing.