To make it easier to see where to place numbers, you can highlight all instances of a number.

You can also check your answers for correctness while playing.

The game stores your current notes and answers, so that you can pick up where you left off the next time you play.

VBA’s core features are as follows:

- save game state at any point
- graphic filters to enhance display: 2xSaI, Super 2xSaI, – - – Super Eagle, Pixelate and Motion Blur
- full screen support
- screen capture (through menu or configured key)
- joystick support
- speed up button
- Gameboy Printer emulation
- Gameboy GB, SGB, GBC and GBC on GBA emulation types
- translation enabled (for emulator only)
- hacking capabilities, including search engine, Gameboy – Gamesharkand GameGenie support and GamesharkAdvance and CodeBreakerAdvance support
- GBA debugger in the SDL version Linux, Windows and BeOS (SDL version)
- import Gameshark Game Saves, codes, etc…
- import battery files from other emulators
- export battery files to other emulators
- sound recording

OpenRA is a highly moddable RTS game engine, in fact both Red Alert and Command & Conquer are implemented purely as mods on it.

The RA mod for OpenRA is a reimagining of Command & Conquer Red Alert. It is not just a clone of the original but has improved and rebalanced gameplay. It has fully working multiplayer support for both internet and local play (via direct connect).

The CNC mod for OpenRA is a reimagining of the original Command & Conquer game. It has fully working multiplayer support for both internet and local play (via direct connect). A single player campaign is currently being worked on.

OpenRA supports the following graphics cards:

Radeon 9500 or later
Nvidia FX (5) series or later
Intel GMA X3000-X4500, GMA 500 or later
(The GMA 900-950 are not supported)

Complete increasingly more difficult missions while gathering money to upgrade your four fully customizable weapons.

Gameplay combines battles, swimming and singing; the latter allows Naija to interact with the world. Her songs can move items, affect plants and animals, and change her physical appearance into other forms. These forms have different abilities, such as firing projectiles at hostile creatures or passing through barriers inaccessible to her in her natural shape.

The Aquaria game engine is licensed under GPL, the game content however, remains licensed under a range of licenses. This division between content and gaming engine has raised an intense debate as to whether Aquaria really is Open Source at all.

The view we take on this at OSL is that the definition of Open Source has had to evolve to keep up with cross-media developments on the Web, so that projects that aren’t entirely made up of source code such as films, music, photos and games etc, can still be included in the ‘spirit’ or ‘ethos’ of OSS. Aquaria fits into this expanding definition.

The Aquaria game engine source code can be found here.

This is a historically-based war/economy game that allows players to relive or rewrite the history of Western civilizations, focusing on the years between 500 B.C. and 500 A.D.

For a list of technical features, game play and graphic information, see the 0 A.D. overview page.

In-game screenshot

Video preview of Alpha version

Unlike most similar games, Open Sonic provides a greater level of interaction between the player and the levels. It’s more than just a jump’n'run; the user must come up with some strategy in order to get through the levels.

Screenshots:

Available free of charge, the game thrusts players into an epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet’s surface, to a subterranean lava-flooded mining facility.

Along with the game get the complete code base for Alien Swarm that features updates to the Source engine as well as the SDK. Alien Swarm adds 3rd person camera, depth of field, improved dynamic shadows and a wide variety of gameplay additions to the Source engine.

* Tactical, 4 player co-op action game with a top-down perspective.
* Complete game code and mod tools
* Unlock persistent items by gaining levels
* Over 40 weapons and equipment with countless loadout configurations
* 4 unique classes and 8 unique characters
* Matchmaking, Steam Cloud, Steam Stats
* 64 achievements
* Tile-based map generation tool
* Powered by Source and Steam