c2 = a2 + b2
c2 = a2 + b2 is the third of 5 stages in Summer Lesson (Event Stages). Boss: Teacher A. Other enemies include Gary Gory, Sir Seal, B.B.Bunny, and Those Guys.
Stage details
- Difficulty
- ★4
- Energy
- 100
- XP
- 8,930
- Base HP
- 75,000
- Length
- 4,600
- Max enemies
- 10
Rewards
- Lucky Ticket ×2 · 100% chance · once only
- Lucky Ticket ×2 · 30% chance
- Lucky Ticket · 70% chance
Enemies
- From the start






- When the base drops to 99%


| Enemy | Spawns | HP | Damage | Range | Details |
|---|---|---|---|---|---|
| From the start | |||||
| At the startForever, every 10–16.7s | 400 | 4040 DPS | 110 | ||
| At 10sForever, every 70–73.3s | 1,000 | 10073 DPS | 110 | ||
| At 11.7sForever, every 70–73.3s | 1,000 | 10073 DPS | 110 | ||
| At 13.3sForever, every 70–73.3s | 1,000 | 10073 DPS | 110 | ||
| At 30sForever, every 83.3–86.7s | 5,000 | 300391 DPS | 170 | ||
| At 66.7sForever, every 16.7–33.3s | 400 | 4040 DPS | 110 | ||
| When the base drops to 99% | |||||
| Instantly | 40,000 | 657821 DPS | 351 | ||
| Instantly7 total, every 13.3–15.3s | 18,000 | 7501,406 DPS | 160 | ||
Like most stages, this one also sends a Ms. Sign if the battle goes past 15 minutes.