Tip: Make sure that ALL exit-enabled pipes, doors, etc. have a screen exit defined, or they'll take you to Level 0, the "endless" bonus game. Unless Start+Select is enabled, the only way out of it is to reset the game.
To not be confused with the Twitch emote Kappa. Kappas are mischievous aquatic turtle-like creatures / youkais who tend to cause a lot of trouble and their favorite food are cucumbers. This replaces the Rip van Fish with a cute sleeping kappa. Credits to No Body the Dragon. Uses vanilla palette.