for the spartan one:
just upgrade the grenade launcher, and get the thing that knocks them over...complete and utter ownage..never got further than two meters into the screen
cleo watch the level the one that leans first take off that block it will lean the other way... take out half them blocks when it leans the other way repeat
lol first level is majorly glitched 2nd level you can just stand in the right corner and nothing kills you and the third level you have to be at least half a square away