I ported HEXEN 1 to PSP, there is first version:
- Video 320x200 (fullscreen)
- Cheats (in menu)
- Save/Load
- Multiplayer AdHoc
Original code i used is this: http://www.libsdl.org/projects/hexen/
If you want doom/heretic multiplayer: http://www.dcemu.co.uk/vbulletin/showthread.php?t=65907
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