Ubuntu Games

Ubuntu games consist of GNOME Games installed as default and KDEGames which are available as a metapackage. Both are free and licensed under the GNU Free Documentation License. Games can be installed with Synaptic and by command line.

GNOME games
GNOME games consist of sixteen games,
 * Aisleriot
 * Chess
 * Sudoku
 * Five or more
 * Four-in-a-row
 * Gnometris
 * Iagno
 * Klotski
 * Mahjongg
 * Mines
 * Nibbles
 * Robots
 * Same GNOME
 * Tali
 * Tetravex
 * Blackjack

KDE
KDE games is a metapackage that installs many games and each game can be installed independently. A listing of game types:
 * Arcade
 * Board
 * Card
 * Dice
 * Logic
 * Strategy
 * Toy
 * Older Games

Other games

 * Americas Army
 * Chromium
 * Doom 3
 * Enemy Territory
 * Frozen Bubble
 * Neverball
 * Rushing Bender
 * SuperTux
 * Tux Racer
 * Tremulous

Links
 * Ubuntu community games