Floor 39 is the 39th floor of Heavenly Tower.
- 1 Codename "Red Riding" spawns as the boss after 26.67 seconds800f.
- 1 Elder Sloth spawns after 10 seconds300f.
- 5 Tackeys spawn after 33.33 seconds1,000f, delay 26.67 seconds800f.
- 4 Mr. Moles spawn after 26.67 seconds800f, delay 20 seconds600f.
The key to this stage is speed. Bring units that are as fast as possible, to sneak through the blind spots of Red Riding, Tackey and Mr. Mole. Manic Lion Cat is a good cat on this level and so are Awakened Bahamut Cat, Maglev Cat and, especially, Zamboney Cat. Spawning Manic Lions as quickly as possible can overwhelm the Elder Sloth, leaving the rest of the enemies vulnerable to their own blind spots.
Remember to time your units well so Red Riding doesn't snipe them. Additionally, Mr. Mole's knockback will affect all Cats that are not immune, and thus can be abused to reset the attack animations of cats with long backswing, most notably Maglev Cat.
Battle: Immediately spawn Zamboney, then spawn Manic Lion when you can afford him so that you can stall the Elder Sloth. You may upgrade your Worker Cat while stalling, and spawn a Fishman, but try to make sure it doesn't instantly die to Elder Sloth or Mina.
After the boss wave hits, you can start spawning units. Try to time them all so that Mina doesn't hit them, although this may be difficult in Zamboney's case. Manic Lion should be spawned such that it can act as a frontline when there is no Zamboney. Maglev should be spawned either after or slightly before Elder Sloth attacks, as this will maximise the amount of times it is hit by Mr. Mole. Timing Maglev is important, as Mr. Mole's knockback can help every one to chain a lot of its extremely powerful attacks and take off a significant portion of Elder Sloth's HP. Minimise use of the Cat Cannon while Elder Sloth is alive, so that you don't sync the Mr. Moles.
Hopefully, Elder Sloth should fall before Mina is in range of the base. Spawn Bahamut to speed up the process of Tackey removal, then you should just be left with Mina and the Moles. If you have any cats in the blindspot of the Moles and are attacking Mina, do not use the Cat Cannon. Otherwise, try and use it to get at least a single Manic Lion in the blindspot. Doing so essentially wins the stage, as the only other enemy that can spawn is a single Ms. Sign. Once Mina is dead, the rest of the stage is completely trivial.