To do the numbers the fastest go 4253001234543210 in that order and you get them all. Oh and to get "contra" if typing it doesnt work press up, up, down, down, left, right, left, right, B, A, and it will work.
Oh and all that story non-sense is pointless in a game like this, the okld one was good if only because it was like, "There are bad things, go kill them." And that was enough.
Loganhab.... It took you 2 hours to beat ten levels? What took so long? Its a great game and if it takes you that long you have no forethought. I mean, the farthest i can get is the 60th level (not on survival... I suck at that one) but its a fun game and I hope they make another one thats even better!