I'm glad to hear you played the original! Laz (who made the original) and me are both old school GM users and this is the remake that no one asked for. There's 5 more levels in total, but over half of the levels have been revamped with new mechanics. I'd say in total there are 20 "new" levels. The game runs in HD now (1920x1080), has all new music, graphics, and a few secrets. This game will certainly run on any Windows 7+ OS.