Now it's the turn of four Megadrive homebrews...
Custodian (Atari ST porting of the homonymous title)
Griel's Quest for the Holy Porron (a sequel/evolution of MSX Griel's Quest for the Sangraal)
Wolfenstein 3D (probably the first popular FPS, this version is very smooth considering the "simple" megadrive hardware)
Zooming Secretary (a simple, but funny, action-puzzle game)