Some free PC games that don't suck.

Spoiler for Battle For Wesnoth:

Battle For Wesnoth is a turn-based strategy game whose philosophy is to keep the gameplay simple and fun. While still abundant in features, it isn't overcomplicated and makes for a fun match between friends.

Site: http://www.wesnoth.org/

Spoiler for Cave Story:

Cave Story is a side-scrolling adventure platformer with a compelling story despite its basic appearance. Innovative and fun!

Site: http://agtp.romhack.net/project.php?id=cavestory

Spoiler for Dink Smallwood:

Dink Smallwood is an isometric RPG similar in nature to the Legend Of Zelda, but considerably quirkier. What makes this game cool is that it comes packaged with a level editor, with a large amount of levels available online.

Site: http://www.rtsoft.com/dink/

Spoiler for Frets On Fire:

Frets On Fire is a PC clone for Guitar Hero, designed so that people would be able to easily make their own custom GH songs. Several sites exist with FoF support and songs.

Site: http://fretsonfire.sourceforge.net/

Spoiler for Gusanos:

Gusanos is an oddball game, a mix of fighting games and the Worms series. You control a worm and battle one-on-one with others.

Site: http://gusanos.sourceforge.net/

Spoiler for I Wanna Be The Guy:

I Wanna Be The Guy is a game based around the idea that games should be near impossible to beat. Around every corner lays a trap waiting to take you out. Good luck on this one.

Site: http://kayin.pyoko.org/iwbtg/

Spoiler for irrlamb:

irrlamb is a marble-type platform game similar to the Marble Blast series. Strangely addictive and loads of fun.

Site: http://code.google.com/p/irrlamb/downloads/list

Spoiler for Knytt Stories:

Knytt Stories is a cute, simple platform game with an open-world basis. Full of laughs and surprises.

Site: http://nifflas.ni2.se/index.php?main=02Knytt_Stories

Spoiler for N:

N is a "ninja emulator" designed in Flash. Features a unique physics engine and a boatload of levels.

Site: http://www.thewayoftheninja.org/n.html

Spoiler for Narbacular Drop:

The predecessor to the award-winning game Portal. Features similar gameplay, as well as several downloadable levels.

Site: http://www.nuclearmonkeysoftware.com/narbaculardrop.html

Spoiler for NetHack:

NetHack is a classic roguelike game for DOS, but is also available in many different graphical formats. The goal is to survive long enough to find the Amulet of Yendor.

Site: http://www.nethack.org/

Spoiler for Neverball:

Neverball is an open-source Super Monkey Ball clone, very similar in gameplay. You use the mouse to navigate the ball through the different levels, all of them more challenging than they appear.

Site: http://icculus.org/neverball/

Spoiler for Plasma Pong:

Plasma Pong is kind of like any other Pong game, except played as though it were inside a lava lamp. Controlling the flow with a few mouse clicks adds a whole new dimension to the game.

Site: http://www.download.com/Plasma-Pong/3000-2099_4-10511143.html

Spoiler for Rocks 'N' Diamonds:

Rocks 'N' Diamonds is a puzzle game similar to Boulder Dash and Supaplex. Very addictive gameplay.

Site: http://www.artsoft.org/rocksndiamonds/

Spoiler for Scorched 3D:

Scorched 3D is an artillery game with 2+ tanks taking turns to destroy opponents in an arena. Choose the angle, direction and power of each shot, launch your weapon, and try to blow up other tanks.

Site: http://www.scorched3d.co.uk/

Spoiler for Seiklus:

Seiklus is a collect-em-all adventure game made in Game Maker with a humongous world to explore and an adorable artistic theme. Filled to the brim with puzzles and collectibles.

Site: http://autofish.net/clysm/art/video_games/seiklus/index.html

Spoiler for SkyRoads:

SkyRoads is a spaceship-based platform game made almost 15 years ago, available for free. Contains tons of levels with tricky tracks.

Site: http://www.bluemoon.ee/history/skyroads/index.html

Spoiler for Shoot The Bullet:

Shoot The Bullet is a top-down shooting game with a unique photograph-taking game mechanic that sets it apart from the other Touhou Project games. Extremely challenging, but extremely fun.

Site: http://www.doujinstyle.com/touhou/shootthebullet.php

Spoiler for StepMania:

StepMania is a Dance Dance Revolution clone, with a plethora of websites hosting songs for download. Includes many features unseen in any DDR game, as well as the ability to make your own song files.

Site: http://www.stepmania.com/

Spoiler for TrackMania Nations:

A very high quality racing game released as a free promotion game. A must-download for racing game lovers.

Site: http://www.trackmanianations.com/indexUk.php

If there are any others, feel free to post and I'll add them to the list =)

Awesome. Thanks, guy.

I fucking love Cave Story, N, and Knytt Stories. Will check out the others though ^^

Neverball and Battle for Wesnoth all the way!
I have some awesome ones on Ubuntu, but I forgot the names.

Trackmania, Stepmania (if you have a mat), Seiklus, and if you can get audiosurf free, FTW!

Cave Story was suggested to me by my beau not very long ago.  I love that game a lot!  Especially that it was made recently but looks totally retro.

"I want to be the guy!"

That game is just amazing and hard at the same time.

Oh wow, Tez, I can't believe I forgot to add that. Doing so immediately~

I think plain old Pinball is good....for an hour or two

EDIT: Flash Flash Revolution is also good, but only if you're playing version 2

~Winged

what about tremulous

Aren't all PC games free? 

what about tremulous

<3
http://tremulous.net/

Whoa i gotta play some of these, also frets on fire xD so many songs, http://www.fretsonfire.net  loads here for people who want to get some.

Liquid War:
A really unique multiplayer game inwhich you control a color and have to absorb the other colors. sort like orpah jk

Chromium:
An awesome super fast "Classic Arcade Shooter".

Holotz's Castle:
Sorta puzzle platformer.

Frets on fire lagged like a motherfucker on my PC, and I have no idea why.  It really shouldn't, audiosurf ran perfectly on highest graphics, as does counter strike and many other games.

Check the settings, or it could be the song, if it was only one, as it works fine for me.

My bro got a disk when he was 5 which had like 50 games including skyroads.
Now skyroads is friggin awesome.


Funny Furries 2:X-Mas

It's a 2-Player platform fighter.

http://www.free-games-net.com/games/funfur2x.shtml

*cheap site good game*

also Red ALert path beyond