@ MysteryFerret: It says somewhere on the screen how many more differences. e.g. The one with the river and bridge: There is a number reflected on the water's surface.
lol need 3 more achievments. Nearly had hellish difficulty achievment, 936 272 score. the other 2 i haven't got are flock of 16 geese and harder, lose within 5 seconds. i've allready bought all upgrades, and no matter how much i try i cant die 3 times, and quick enough.
Easy way to pass your nightmare: Fight until you die, when you die DON'T press x to get past the text. Your enemy will keep on fighting, but eventually you will win, as the rocks and stuff keep on falling and killing him, and you still get the gems, even though you can't move.