This is a great game on many levels - but has a terrible structure for all but the most hardcore of time-losing gamers. The big problem with this game is that you can only save at the end of levels - and some are massive. So your only options are to either play through the entire level (some take hours), or quit part of the way through and start over at a later date. If you don't have lots of time to dedicate to this game, then you should steer clear. The sanctuary of lava, for example, requires at least 2 hours to clear properly - and remember NO SAVING! It's too bad that such a wonderful game has such a fatal flaw.