PrBoom is a cross-platform version of the classic 3D first person shooter Doom from id Software. Originally written for PC, PrBoom has been lightly modified to run on Wiz.

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Turns out you can set to run in 16 bpp mode.
The config file and scripts are fixed get it here
Runs great, filters turned on by default.

http://www.gp32x.com/board/index.php?showtopic=46353