Infinite Squire Rels spawn after 40 seconds1,200f, delay 16.67~26.67 seconds500f~800f.
Strategy[]
As you can only use Normal, Uber, and Legend Rare Cats, the only options here are to rely on ubercarry and win, or instead use highly leveled Normal Cats. Without the right Ubers and Legends, a Cat Combo (or several) may be necessary to assist your Normal units.
The main thing to look out for is the support of the Doge and Roo variants. Wahwah's constant knockback and swift multi-hits allow both himself and his peons to easily waltz in to your base. You will need to find a way to keep the king at bay while lasting long enough that the support begins to dry up in which you can whittle down Wahwah without much worry.
Recommended Ubers[]
The following Uber Rares are good for this stage, and if you have any of these, using them will make things easier.
Noting how you will need to focus on 3 traits (Black, Alien, Zombie) as well as the limited unit pool to choose from, the Recommended Ubers section will contain Ubers that have been shown to help against a specific trait. Units that are Strong or do Massive Damage are recommended, as the longer they're at your base, the less room you will have since Wahwah will continuously knock your units back.
Generalist Ubers: Ubers that can either help against more than one trait and/or help against Wahwah.
Ganglion: Anti-Zombie/Alien + Zombie Killer, just watch your money.
Eva Unit-01: Another Anti-Zombie/Alien + Zombie Killer, can be used as a substitute or conjunction with Ganglion.
Mighty Lord Gao: Universal Strong ability against all traited enemies. Take note that he does not have Zombie Killer and can be a cash sink.
Divine Kai: Divine Kai's knockback immunity, massive HP and damage, and point-blank range allows her to nearly carry the stage, being able to solo Wahwah without his support. Since the Roos are only singular, she can also be used to get a quick kill on them.
EPICFEST Ubers: These units target Traitless units and can thus prove effective against King Wahwah himself.