Special Stages · Stage 1
Runaway Ball
暴走する大玉
Runaway Ball is a Battle Cats stage in River City Ball-Rolling. It costs 30 energy and sends 4 enemy spawn lines — led by Large White Ball as the boss — against a 1,500 HP enemy base, and clearing it rewards 4,230 XP.
Data updated: 2026-09-15
30Energy Cost
4,230XP Reward
1,500Enemy Base HP
3,600Stage Length
20Max Enemies
1.1Difficulty
Enemy spawns (4)
| Enemy | Strength | Count | First Spawn | Respawn | Base HP Trigger | Notes |
|---|---|---|---|---|---|---|
 Large White Ball | 100% | 1 | 13.3s | — | 100% | — |
| Large White Ball | 100% | 2 | 0s | 13.3s | 90% | — |
| Large White Ball | 10% | 1 | 0s | — | 90% | Boss |
 Ms. Sign | 100% | ∞ | 900s | 900s | 100% | — |