Special Stages · Stage 3

c2 ＝ a2 ＋ b2

c2 ＝ a2 ＋ b2 is a Battle Cats stage in Summer Lesson. It costs 100 energy and sends 9 enemy spawn lines — led by Teacher A as the boss — against a 75,000 HP enemy base, and clearing it rewards 8,930 XP. Its enemies carry the Red trait, so cats that target it do the most work here.

Data updated: 2026-08-31

100Energy Cost
8,930XP Reward
75,000Enemy Base HP
4,600Stage Length
10Max Enemies
4.1Difficulty
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Cats that counter c2 ＝ a2 ＋ b2

Cats whose attacks target Red, best DPS first — the traits this stage’s enemies actually carry:

Chun-LiLovestruck Lesser DemonBunny & CanardDaybreaker IzanagiMighty Rekon KorpsSea Maiden Ruri

Stage rewards

100% — Lucky Ticket ×2 · first clear30% — Lucky Ticket ×270% — Lucky Ticket ×1

Enemy spawns (9)

EnemyStrengthCountFirst SpawnRespawnBase HP TriggerNotes
Those Guys200%∞0s10s~16.7s100%—
B.B.Bunny200%∞10s70s~73.3s100%—
B.B.Bunny200%∞11.7s70s~73.3s100%—
B.B.Bunny200%∞13.3s70s~73.3s100%—
Sir Seal200%∞30s83.3s~86.7s100%—
Those Guys200%∞66.7s16.7s~33.3s100%—
Gary Gory50%70s13.3s~15.3s99%—
Teacher A100%10s—99%Boss
Ms. Sign100%∞900s900s100%—
All Summer Lesson stages