First go to 2 player mode and choose Big E's house or what ever it it's called. Get the recruiter grenades and throw it at any of those mils and then try to kill the other player so the other player can't destroy any of your mils. once you've
got all the mills on your team Keep killing the other player to get Super brawling bot supreme or what ever it's called and you get HEAPS of mils on your team
To unlock General Corrosive in multi-player, collect a grand total of 110 secret chips.
To unlock the original concept movie, complete the whole Campaign (Story) mode.
COROSSIVE CITY:COLLECT 110 SECRET CHIPS
DMA DEATH SPHERE:COLLECT 40 SECRET CHIPS
MAC MINES:COLLECT 138 SECRET CHIPS
MATT'S BIG FUN GUN:COLLECT 8 SECRET CHIPS
MORBOT LAND:COLLECT 15 SECRET CHIPS
RUINS:COLLECT 60 SECRET CHIPS
THE COLISEUM:COLLECT 85 SECRET CHIPS
THE REACTER FACTOR:COLLECT 25 SECRET CHIPS
THE TRENCHES:COLLECT 4 SECRET CHIPS