For the powerpool, start off with 2 monkeys in middle of stage, one set for first and other for strong. upgrade to peircing darts and forget about them. Save up for planes and keep placing them through the whole game. Upgrade 2 to rapidfire, so camos will be detected and you're good.
WHY IS LEVEL 2 ENDLESS?!?! I've been sitting here watching the enemies come on fast for 10 minutes and I have about 20000 dollars. WHY WONT THIS LEVEL END AND WHAT IS THE POINT OF THE THINGS IN THE UPPER LEFT CORNER IF THEY CAN'T BE PLACED?!?! CAN SOMEONE TELL ME?