What makes all of these things so depressingly obvious is that, despite sending you scouring every nook and cranny of the game's levels, there's always a very precise order to your progression, and you very rarely seem to have any doubt about the next thing you need to do - or where you need to be. Blow up three power generators? Well, they can only be hiding behind the giant, door-sized extractor fans, surely, since they're the only things we haven't gone near yet?