Tenebrae by Haplo is a reflexion/puzzle game for Amstrad CPC. You are moving in a roguelike environment with an important twist : you can only do it a lighted zone... It's an interesting game, I recommand to try it. It exists already for ZX Spectrum, Commodore and PC. You can see two video of tests :

• Tenebra by Passion Jeux Vidéo TV
• Tenebra by Amstrad CPC World