Beat Ocean Road on Hard...but you can't use Monkey Buccaneers, Monkey Aces, or Dartling Guns and you only can place one of each tower! Starting cash is normal. Reward is $85 MM. Good luck!
This is meant to get Bloons Conception Wiki admin Meta07 to go nuts, mainly because after placing 1 of each tower, he spams the three towers that aren't allowed in this challenge.