Probably not retro, but i still wanted to mention Zeebo; it's such a weird machine... No one loved it, with the probable exception of proud, poor third worlders. Still, software houses like Electronic Arts, Activision, Namco, Capcom and id Software invested on it, due to its characteristics; the following videos are some game versions of famous titles, for the aforementioned Zeebo.
Quake
https://www.youtube.com/watch?v=hX-1ZQpObnM
Quake II
https://www.youtube.com/watch?v=NdvbMDOYzkY
Prey
https://www.youtube.com/watch?v=liCYSYBMu2k
(Probably the best of all): Resident Evil 4
https://www.youtube.com/watch?v=RBh-vBFeegs