Yet another advanced challenge doing nothing more than seeing how fast you can sell (sacrifice) and rebuy and re-upgrade.
Key things to note:
1. Adora needs to be placed on frozen water.
2. The 1st time you sacrifice and then rebuy glue gunner, he needs to be placed on frozen water when re-bought.
3. After sacrificing ice tower and rebuying glue and ice, wait until bloons are at exit so all remaining bloons are on the screen.
Other than that, it is just a matter of how fast can you sacrifice, rebuy and upgrade. Good Luck.