Rock'n 4 (Japan, prototype)

The fourth mainline game in Jaleco's Rock'n series of rhythm games, released after the two-player Rock'n MegaSession and before the sole home console release, Rock'n MegaStage.

The player presses a tilting "pick switch" in time with the instrument (selectable from guitar, bass, and keyboard) while simultaneously pressing a foot pedal in time with the drums. In MAME, this is emulated as simply pressing two buttons.

This was the final arcade release in the Rock'n series due to Jaleco settling a lawsuit from Konami over the games' similarity to the beatmania series, forcing them to withdraw all boards from the arcade market.