This is the 40th and final floor of the Heavenly Tower, up to update 6.7. However, update 9.6 added in 10 more Floors.
Battleground
Mystic Mask Yulala spawns after a few seconds. Supporting him are Trolly Bloggers, Mr. Angels, and Gabriels which spawn periodically, just like on Floor 30. When the enemy base is down to 90%, a massive horde of Mr. Angels will spawn- don't let them catch you off guard.
Strategy
The showdown against Yulala is no doubt one of the hardest challenges the Heavenly Tower has to offer. Yulala moves faster than lightning and has the attack power and ability, a guaranteed chance to warp your cats almost a fourth of the way backwards on the battlefield, to render almost all cats useless against him.
Keeping Yulala stalled is critical. By constantly spawning Manic Mohawk Cats with perfect timing, Yulala can be held in place, but extreme caution must be taken, and countermeasures must be in place to ensure the peons don't kill the Mohawks before they can effectively stall Yulala. Warp Blocker cats can be considered, but players should use cats that can take multiple hits, like Zamboney Cat.
Keeping Yulala slowed is another helpful way at controlling his pace across the battlefield. Glass Cat is very good for this, but players can also use Assassinlan Pasalan and/or Cyberpunk Cat, both of which outrange Yulala and can keep him slowed. The slow effect does not last without massive stacks of these cats, however, so keeping Yulala in place is still critical.
Long-range, massive damage cats like Tesalan Pasalan and Ultima Galaxy Cosmo are very good for picking off Yulala's health bit by bit, as long as Yulala is stalled. Sniper the Cat and Sniper the Recruit can keep Yulala a safe distance away from closer-range hard litters, like Ganesha.
Also, take care to bring something for the Mr. Angel swarm at the end of the stage if your army doesn't seem fit to face that part. It is a horrid feeling to finally beat Yulala, only to lose to the peons, so it may be worth saving a slot for a midranger like Cameraman or for a tank like Ramen.
Glass Cat, Lone Cat and Kitten, Driller Cat and Supercat are all helpful here thanks to their anti-traitless abilities. Glass and Lone cat can further stall Yulala, and push him back further when true formed. When true formed, Macho Crystal Cat slows Yulala for 10 seconds, and his cool down time is about 21 seconds. This means that the stalling required to kill Yulala is effectively halved. On his cool down, Tourist Cat can aid you units by pushing Yulala while Glass is on cool down. These greatly reduce the difficulty of Yulala, making his stage much more manageable.
If timed correctly, cats such as Slime Cat and Teacherbear Cat can deal insane amounts of damage to Yulala in seconds. Slime cat in particular being extremely effective in getting rid of mass hordes of oncoming peons with it’s devastating shockwave nearly OHKOing the Gabriels at max level.
Ubers such as the Epicfest Exclusives, most Lugas and some others can be of great hep here, especially those with anti-traitless abilities, LD to deal with the peons or just great damage.
Strategy 1
Row 1: Manic Mohawk, Manic Eraser, Zamboney Cat, Glass Cat, Manic King Dragon
Row 2: Bullet Train Cat (MUST BE TRUE FORMED), Manic Macho Legs
Powerups: Rich Cat, Cat CPU, Sniper Cat
This strategy was found by the YouTuber Anwar04, and is currently one of the the easiest no uber ways to beat Floor 40.
Before you even enter the stage, level up your cats as high as possible, ESPECIALLY Bullet Train. If he is lower than Level 38, he will not be able to survive a Yulala hit, making the strat unusable. Level 50 is recommended, but 40-45 should work too.
When the level begins, turn off CPU and spam Manic Mohawk like you would normally. Summon Glass Cat as soon as Yulala appears, then Zamboney after reaching about 4,300 money. Keep spamming Manic Mohawk, then summon another Glass Cat and Zamboney after the first Trolly Blogger dies. Turn on CPU at about 9,000-10,000 money.
Sit back and maybe even get something to eat. This will take quite a while. Rest assured, however, that you will not run out of money at any point during the fight, CPU can spam Manic Mohawk perfectly, and the stage is in the bag once it is activated. Enjoy your tickets and your new cat!