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.
Froggix is a clone of the classic '80s arcade game Frogger. The aim of the game is to help four frogs to cross a busy road and a treacherous river to get to their homes. Extra points are awarded for catching flies and completing each level quickly. The game features funky electro-music, great sound effects, and a highscore table.
ePingu is a game in which you must save a lot of penguins that were sent to a tropical Isle when a huge secret study on the South Pole went terribly wrong. You've been sent after them equipped with a pocket teleporter. You should send back as many penguins as you can before the teleporter stops working completely. The teleporter discharges with every tap, so you must recharge it once in a while.