Round 1 is the 1st stage of Colosseum: Half-Off Plus. Next stage: Round 2.
Half-Off+: Special超半額セット EX
Special Unit deploy costs are halved, with deploy cooldowns shortened by 30%! Plus, two units will be deployed at once!
Special cats have cooldown shortened by 30% and spawning one will spawn another instantly.
One rule applies to the whole run; the icon at the bottom-left of the stage select confirms which one is in effect. Some Cat Combos may not activate under it.
UltraBaaBaa and General GreGory carry Barriers (up to 266,000 HP) — your hits are absorbed until it's broken.
UltraBaaBaa's 266,000 Barrier needs a guaranteed 100% Barrier Breaker — chance-based units stall and waste your damage window.
SUPERCAR CAT B Guaranteed 100% Barrier Breaker. Also fits “Burst the boss down.” 
FENCER CAT A Guaranteed 100% Barrier Breaker at long range — the reliable accessible breaker. Also fits “Out-range J.K Bun Bun.” 
MIZLI S 100% chance to break Alien Barriers. Also fits “Out-range J.K Bun Bun.” 
LUMINA S 100% Barrier Breaker opens Star Alien Barriers for the team. 
TEKACHI A 100% chance to break Barriers. Also fits “Counter Floating.” 
BORA S 100% Barrier Breaker reliably cracks Star Alien Barriers. 
J.K Bun Bun is Red. Anti-Red units take less damage and deal more.
FISH CAT A Strong Against Red and tanky for the cost — a sturdy anti-Red frontliner. 
ZOMBIE CAT B Strong against Red — 1.5x damage, takes 1/2. Also fits “Clear the crowd.” 
CARPENTER CAT A Resistant to Red — durable against Red attackers. Also fits “Counter Floating.” 
BATH CAT A Deals Massive Damage to Red enemies. Also fits “Out-range J.K Bun Bun.” 
CAT CLAN HEROES S Weakens and damages Red. Also fits “Out-range J.K Bun Bun.” J.K Bun Bun is Floating. Anti-Floating units take less damage and deal more.
SABER THE CAT C Saber Alter Cat: Strong against Floating enemies (Deals 1.5x damage, only takes 1/2 damage) 
ARCHER CAT A Deals Massive Damage to Floating enemies. Also fits “Out-range J.K Bun Bun.” 
BODHISATTVA CAT A Slows and (True) Weakens Floating enemies. Also fits “Clear the crowd.” 
CATMAN S Massive Damage vs Floating (Normal). Also fits “Out-range J.K Bun Bun.” 
HIGH LORD BABEL S Equally tough against Floating enemies, with Colossus Slayer. Also fits “Counter Red.” J.K Bun Bun reaches 200 range. Units that out-range it can chip safely without taking hits.
GROSS CAT A Range 350 — fires from beyond its 200. 
MASTER URIL A Range 405 — fires from beyond its 200. Also fits “Clear the crowd.” 
SALON CAT S Range 350 — fires from beyond its 200. Also fits “Clear the crowd.” 
CAT TOASTER A Range 330 — fires from beyond its 200. Also fits “Break the Barrier.” 
MIGHTY REKON KORPS S Range 470 — fires from beyond its 200. Also fits “Burst the boss down.” J.K Bun Bun has a deep HP pool (400,000+ even before stage magnification). Heavy single-target burst shortens the fight.
SUPERCAR CAT B 51,000 damage per hit at Lv.30. Also fits “Break the Barrier.” MIGHTY REKON KORPS S Among the highest single-hit Area damage available. Also fits “Out-range J.K Bun Bun.” 
GAIA THE CREATOR S Long-Distance multi-hit with Insane Damage — a generalist wall-cracker. Also fits “Out-range J.K Bun Bun.” 
BAHAMUT CAT S Huge multi-hit burst — a story-unlock powerhouse that deletes tanky enemies. 
CHILD OF DESTINY PHONO S Big Multi-Hit Massive-Damage bursts from safety. Also fits “Out-range J.K Bun Bun.” 7 enemy types stack up here. Area attackers hit the whole push at once instead of one unit at a time.
URURUN WOLF A Area attacks hit everything in range. Also fits “Out-range J.K Bun Bun.” 
COURIER CAT A Area attacks hit everything in range. Also fits “Counter Red.” 
DELINQUENT CAT A Area Multi-Hit clears grouped enemies. Also fits “Counter Floating.” CATMAN S Long-range Area damage clears groups. Also fits “Counter Floating.” 
ACTRESS CAT B Hits multiple enemies at once for budget crowd damage. Also fits “Out-range J.K Bun Bun.” 
The castle you destroy to clear the stage.