Advanced game engine for it's time.
Played this game via my steam account. Would have prefered to get it on GOG thought. Mainly because of DRM. The game itself has some excellent puzzles. At first I thought they were easy, but then they started to vary in difficulty and scope. I work as a programmer and I had a lot of help from my proffesional experience in this game. For some of the puzzles, I had to exit the game and come back a bit later. With a blank slate on my thinking process.
