Super Mario War

http://smw.72dpiarmy.com/

A single-screen fighting game a la Super Mario All-Stars

I'll copy the features here.

- Up to four players deathmatch fun
- a whole bunch of game modes (featuring GetTheChicken, Domination, CTF, ...)
- Comes with the leveleditor
- you can create your own maps...
- ... and a lot of people did so. There are currently over 1000 maps
- More fun than poking a monkey with a stick
- The whole source code of the game is available
- uses SDL and is fully portable to windows, linux, mac, ...
- CPU Players
- will make you happy and gives you a fuzzy feeling

Here's what it fails to mention. It's not online yet but it's their to priority supposedly. Also in their forums you'll be able to find the latest beta which allows you to play in actual worlds and comes with a world editor.

Sonic Robo Blast 2

SRB2 - Windows Only

SRB2 is a freeware Sonic game that I and a few others from IRC play. You can add several add-ons to the game and play Online with friends, and you can play Singleplayer and unlock several things ranging from cheats to bonus levels.

And just for the hell of it, here's some more copypasta from the features list on the site.

• Beautiful 3D Enviroment, with free movement in all directions.
• Multiple choice of characters, including Sonic, Tails and Knuckles, each with different moves, weaknesses and advantages.
• Customizable - includes the ability to create your own levels, characters, level music and sounds and, with knowledge of programming, even a whole new game.
• Internet multiplayer, with plenty of gameplay modes.
• Hidden levels and goodies to unlock.
• Original Soundtrack produced by some of the best Sonic music artists on the Internet.
• Over 30 levels to play, featuring a variety of locations, from green meadows, to deep underwater ruins, castles, deserts and space stations.
• Multiple routes to choose from.
• And much, much more!

That should cover just about everything.

Trackmania Nations Forever

Trackmania Nations Forever - Windows Only

Trackmania Nations Forever is a free racing game.

I'll just copy something from the TMNF page:

A free game in the truest sense of the word, TrackMania Nations Forever lets you drive at mind-blowing speeds on fun and spectacular tracks in solo and multiplayer modes. Nations Forever will offer a new "Forever" version of the Stadium environment, a solid solo mode and 65 brand new, progressively difficult tracks. TrackMania Nations Forever will unite an even larger number of players than the original Nations thanks to its engaging multiplayer modes, innovative online functions and revolutionary interactivity between players.

TrackMania Nations Forever will offer a new "Forever" version of the Stadium environment, a solid solo mode and 65 brand new, progressively difficult tracks. TrackMania Nations Forever will unite an even larger number of players thanks to its engaging multiplayer modes, innovative online functions and revolutionary interactivity between players.

For TrackMania Nations Forever, Nadeo studio chose to take advantage of the PC's capacities as a gaming, creative and communications platform in order to allow a greater number of players to share a unique gaming experience.


Features :

A completely free game.

A captivating solo mode with 65 brand new tracks.

Solo and team based multiplayer modes. Join millions of players online on the TrackMania servers.

One complete TrackMania environment: Stadium ‘’Forever’’.

An in-game editor to create your own tracks, video studio to realize your own movies and a paint shop to customize your vehicles.

Official ladders for solo and multiplayer.

Compatible with TrackMania United Forever (profile and multiplayer servers).



It might not run very smoothly on older computers, I'm not sure. But anyway, I love this game.