Final Battle

The Final Battle is a Special Mission unlocked when the player is Rank 80 and has the gold medal for all of the tracks. It's the last thing the player can unlock. This Special Mission has only 2 rounds:

Round 1
You're given 200,000$ start cash! (But believe me that's not enough!) This round takes place at the Grand Monkeyopolis. In this round, first you'll fight the Apopalypse Bloon. Then when it's supposed to be popped, it'll flee and you'll be greeted with the Genesis Bloon. After you defeat it, the round is completed. You'll then warped to a special track just for this mission: Hell, Heaven, the God and the Devil. You'll keep all of your towers but you'll need to replace them.

Round 2
First, you'll fight the Apopalypse Bloon and the Genesis Bloon again... TOGETHER! After you defeat them, they'll fuse and become the Chaos Bloon. Good luck fighting the Final Boss! :)

Rewards

 * 5000 AP; 15000 MM; 12,000,000 XP (though it'd be useless by now.)

Trivia

 * If you complete this Special Mission, you can consider yourself beaten the whole game itself.