These are games situated in four spatial dimensions. They do not have to be rendered realistically: some of them use 3D+stereo, some just 3D, and some only 2D.
This is not meaning the other described fourth dimension, that of time. Technically all games exist in time and would thus be 4D.
List of 4D games
This is a list of free/libre 4D games:
The game uses 2x2x2 levels, thus having a 8-cell bottom like most 2D Tetris games do.
The source code (there is no media, shapes are drawn automatically) is licensed under the GPLv3 or any later version.
|4D Maze Game||2008-02-01||4D, maze navigation (Educational?)|
4D Maze Game is a game where the player navigates a 4 dimensional maze. The latest version was released in February 2008. The game has been developed by John McIntosh in the Java programming language. It has been released into the public domain, it is free software since the source code is available on the homepage.
54321 is a set of four-, three- and two-dimensional (all presented as a number of 2D boards on the screen) implementations of five classic puzzle games. It is written in C++ by Patrick Fleckenstein for the 1mb SDL Game Programming Contest sponsored by Linux Journal, Loki Software, and No Starch Press. The latest downloadable version is v1.0.2001.11.16.
|Adanaxis||A single-player 4D first person shooter in outer space|
Adanaxis is a deep space first-person shooter game in four spatial dimensions, written by Andy Southgate. The latest version of the game is 1.2.5. It is written in the C++ programming language using the GLUT library.
|Tesseract Trainer||June 9th, 2005||demo, stereograms, hyperspace, educational|
Tesseract Trainer is a demo that displays a tesseract (the four-dimensional hypercube, analogue of the three-dimensional cube) as a 2D image, or viewable as a 3D image using a method similar to that one for viewing stereograms. Although it contains shareware functionality (“Unregistered” is displayed in the corner, and a registration code ($8) request appears after some time of continuous running), the source code is available under a GPLv2-compatible license (apparently public domain except for the reused parts like GLUT). It is written in C++, and the latest version is 0.1.4, released on 2005-06-09. It used GLUT, SDL, among other libraries.
The author released all the copyright rights for the game’s documentation.