5 — Risqué Terrain

Cave stages full of double entendres and double Master A.s. Otta-smack-u debuts in the finale, Thriller Bridge.

Easy, but noticeably less easy than the first four sub-chapters, and most stages are built to be annoying rather than hard: Master A. and THE SLOTH each appear twice. The wiki flags three stages — Enticing Tunnels (THE SLOTH plus St. Pigge the 2nd), Twin Peaks (highly buffed Shy Boys and The Face), and Thriller Bridge, where Otta-smack-u makes his first appearance.

Otta-smack-u is the lesson stage: moderate health, high attack, fast attack rate, and a tiny money drop — he breaks through careless defenses and pays you almost nothing for killing him. (The entire sub-chapter is one long suggestive Japanese pun; every stage shares the same cave background.)