If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Think you're good at Bloons? Think again. This pack contains 50 of the hardest, meanest, most brutally insane Bloons levels ever devised by man or monkey
Aim with mouse, click and hold to choose power. Pop the target number of bloons to pass each level. Good luck with this pack.