Yes, I am familiar with game decompilation projects. Some notable decompilations include The Legend of Zelda: The Ocarina of Time and Super Mario 64. There are also many other decompilation projects for various console games such as NES, SNES, N64, PS1, 360, GBC and GBA.

The legality of decompilation depends on the country and the End User License Agreement (EULA) of the binary you wish to work with. In the USA, it is legal as long as the software was obtained legally. However, if the license prohibits it explicitly (and most software licenses do), then it is a breach of the contract which the license constitutes – thus “illegal”, but a matter of civil law, not penal. The DMCA also has ramifications in the matter.
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