Warzone 2100 offers campaign, multi-player, and single-player skirmish modes. An extensive tech tree with over 400 different technologies, combined with the unit design system, allows for a wide variety of possible units and tactics.

GNOME 2048 provides a 2D grid for playing 2048, a single-player sliding tile puzzle game. The objective of the game is to merge together adjacent tiles of the same number until the sum of 2048 is achieved in one tile.

Quadrapassel comes from the classic falling-block game, Tetris. The goal of the game is to create complete horizontal lines of blocks, which will disappear. The blocks come in seven different shapes made from four blocks each: one straight, two L-shaped, one square, and two S-shaped. The blocks fall from the top center of the screen in a random order. You rotate the blocks and move them across the screen to drop them in complete lines. You score by dropping blocks fast and completing lines. As your score gets higher, you level up and the blocks fall faster.

Cowsay is basically a text filter. Send some text into it, and you get a cow saying your text. If you think a talking cow isn't enough, cows can think too: all you have to do is run cowthink. If you're tired of cows, a variety of other ASCII-art messengers are available.

HyperRogue is a game in which the player collects treasures and fights monsters -- rogue-like but for the fact that it is played on the hyperbolic plane and not in euclidean space.

In HyperRogue, the player can move through different parts of the world, which are home to particular creatures and may be subject to their own rules of "physics".

While the game can use ASCII characters to display the the classical rogue symbols, it still needs graphics to render the non-euclidean world.

Libmanette is a small GObject library giving you simple access to game controllers. It supports the de-facto standard gamepads as defined by the W3C standard Gamepad specification or as implemented by the SDL GameController.

Arx Libertatis is a cross-platform port of Arx Fatalis, a 2002 first-person role-playing game / dungeon crawler developed by Arkane Studios. This port however does not include the game data, so you need to obtain a copy of the original Arx Fatalis or its demo to play Arx Libertatis. Arx Fatalis features crafting, melee and ranged combat, as well as a unique casting system where the player draws runes in real time to effect the desired spell.

This is an open-source port of the Serious Engine from Serious Sam: The First Encounter and Serious Sam: The Second Encounter. To run, you must put your official game data, Levels and Help in ~/.local/share/Serious-Engine/serioussam,serioussamse/gamedata/.

BZFlag is a 3D multi-player multiplatform tank battle game that allows users to play against each other in a network environment. There are five teams: red, green, blue, purple and rogue (rogue tanks are black). Destroying a player on another team scores a win, while being destroyed or destroying a teammate scores a loss. Rogues have no teammates (not even other rogues), so they cannot shoot teammates and they do not have a team score.

There are two main styles of play: capture-the-flag and free-for-all. In capture-the-flag, each team (except rogues) has a team base and each team with at least one player has a team flag. The object is to capture an enemy team's flag by bringing it to your team's base. This destroys every player on the captured team, subtracts one from that team's score, and adds one to your team's score. In free-for-all, there are no team flags or team bases. The object is simply to get as high a score as possible.

lierolibre is an earthworm action game where you fight another player (or the computer) underground using a wide array of weapons.

Features:

• 2 worms, 40 weapons, great playability, two game modes: Kill'em All and Game of Tag, plus AI-players without true intelligence!

• Dat nostalgia.

• Extensions via a hidden F1 menu:

  • Replays

  • Game controller support

  • Powerlevel palettes

• Ability to write game variables to plain text files.

• Ability to load game variables from both EXE and plain text files.

• Scripts to extract and repack graphics, sounds and levels.

To switch between different window sizes, use F6, F7 and F8, to switch to fullscreen, use F5 or Alt+Enter.

In FreeGish you control Gish, a ball of tar who lives happily with his girlfriend Brea, until one day a mysterious dark creature emerges from a sewer hole and pulls her below ground.

Barrage is a rather destructive action game that puts you on a shooting range with the objective to hit as many dummy targets as possible within 3 minutes. You control a gun that may either fire small or large grenades at soldiers, jeeps and tanks. The gameplay is simple but it is not that easy to get high scores.

MegaGlest is a cross-platform 3D real-time strategy (RTS) game, where you control the armies of one of seven different factions: Tech, Magic, Egypt, Indians, Norsemen, Persian or Romans.

Freedroid RPG is an RPG (Role-Playing Game) with isometric graphics. The game tells the story of a world destroyed by a conflict between robots and their human masters. To restore peace to humankind, the player must complete numerous quests while fighting off rebelling robots---either by taking control of them, or by simply blasting them to pieces with melee and ranged weapons in real-time combat.

The sdl-jstest and sdl2-jstest commands can list the available joystick controllers as found by the SDL or SDL2 libraries, respectively. It can show the available axes, buttons, hats and balls of a chosen controller, and can display the controller actions in real time in a visual fashion.

GNU XBoard is a graphical board for all varieties of chess, including international chess, xiangqi (Chinese chess), shogi (Japanese chess) and Makruk. Several lesser-known variants are also supported. It presents a fully interactive graphical interface and it can load and save games in the Portable Game Notation.

Fish Fillets NG is strictly a puzzle game. The goal in every of the seventy levels is always the same: find a safe way out. The fish utter witty remarks about their surroundings, the various inhabitants of their underwater realm quarrel among themselves or comment on the efforts of your fish. The whole game is accompanied by quiet, comforting music.

vcmi is an implementation of the Heroes of Might and Magic III game engine. It requires assets and game resources to play; it will look for them at ~/.local/share/vcmi folder.

Crispy Doom is a friendly fork of Chocolate Doom that provides a higher display resolution, removes the static limits of the Doom engine and offers further optional visual, tactical and physical enhancements while remaining entirely config file, savegame, netplay and demo compatible with the original.

Mr. Rescue is an arcade styled 2d action game centered around evacuating civilians from burning buildings. The game features fast-paced fire extinguishing action, intense boss battles, a catchy soundtrack, and lots of throwing people around in pseudo-randomly generated buildings.

Li-Ri is a game in which you drive a wooden toy steam locomotive across many levels and collect all the coaches to win.

Eboard is a chess board interface for ICS (Internet Chess Servers) and chess engines.

This is a clone of the classic game BurgerTime. In it, you play the part of a chef who must create burgers by stepping repeatedly on the ingredients until they fall into place. And to make things more complicated, you also must avoid evil animate food items while performing this task, with nothing but your trusty pepper shaker to protect you.

Provides a large set of Go-related services for X11:

• Local games with precise implementation of the Chinese and Japanese rulesets

• Edition and visualization of SGF files

• Connection to the NNGS or IGS Go servers

• Bridge to Go modem protocol, allowing to play against Go modem-capable AIs such as GnuGo.