Guys, I would give it 5 star and agree with all the comments below except - the game has a serious bug and I can't continue. I have tried it on both Mac and PC. It's a fantastic and fun game - the maze in the Mars Colony is seriously annoying, it seems the authors made this more difficult than the original. When I finally made my way through after many attempts, I cannot access the airlock which allows the next step. Is this a bug? I tried everything, made my way through the buckets and the annoying maze and now cannot get through the airlock? Does anyone have any advice, there don't seem to be any forums for this one.