Dire Dire Docks 100 Coins in 0.5 A Press (A Button Challenge RetroAchievements)

No save states used (RetroAchievements hardcore mode). I clone 23 red coins with the green shell. You can respawn the shell by pressing B before landing onto shore (5 frames). If you miss the window, you have to start over, as the shell will vanish from your hands and won't respawn. You cannot clone the blue coins since they’re inactive.