In Untahris Common Playground, one can play several classic fun, simple arcade games (similar to snake, tron, tetris, rampart, thrust, pong, and bomberman). In the multiplayer mode, each of the players can play a different game on the same area, which may lead to funny interactions. TCP/IP is supported.
cave9 is a gravity cave-exploration game. It's a first person 3D version of the classic SF-Cave game. Your ship travels into a procedurally-generated cave at constant forward speed, and you have to control two diagonal thrusts to keep it from hitting the walls. As the game progress, the cave will twist more and become more tight.
Bastet ("bastard tetris") is an ncurses Tetris clone which is harder than every other tetris released. It is based on a heuristics engine which tries to detect which block you need or don't need, and then gives you the blocks that you don't need. For instance, if you usually play by leaving long "canyons" one square wide and then waiting for the long "I" block, you'll have to wait till eternity before you see it. The heuristics have been worked on for some time and are quite nasty.
Mtp Target is a multi-player online action game working on Windows, Linux and Mac where you fight with and against players. It's a mix of action, dexterity, and strategy game. After rolling down a giant ramp, you must delicately land your avatar on the platform that will reward you with the most points. With your friends, you can set up strategies to eject the other players off the platforms in order to score maximum points.