Okay so I just beat the game on masochist..not so hard after you beat it on normal first, anywho, for anyone that needs help on the last level (25th) Everyone knows its a cake walk all the way up till the stupid agent smiths..what ive found is the boomstick at max level can destroy them easily if you can manage to get your critter to go off, if your good at evading (having the ABF and active barrier is a must) just spam your active barrier since youll prolly get healed a bit more than you get hit and try to dash whenever to dodge all the stray bullets when your barrier is on cooldown, this isnt very detailed because its all over the place..but anywho, you can also try the big kaiser on smiths, if you hop about enough they will slowly kill em regardless of all the misses...and if you dont like missing use the chainsaw, thats how I beat it on masochist (spammed barrier, abf, slow-mo, and teleported into their face and tore them a new one..just some insight..Goodluck everyone else =D
Made it to 62..Tip on destroying MOAB's easily..Just spam pineapples on them, they blow up in like 6 or 7 of them, it also takes out most of the bloons that come out of it