Regentropfen (German for "Raindrops") is a Keen 1 mod by Grandy02. Released on April Fools' Day 2015, it reduces Keen 1 to a simplistic minigame with the player character, a "jolly bucket", being limited to horizontal movement in a one-screen level. The objective is to let the bucket catch as many of the randomly falling raindrops as possible within 90 seconds. Afterwards, the brief ending automatically appears, followed by the high score entry window if applicable. The mod is mostly in German, but English translations are provided in form of the "story" text. Regentropfen parodies the Poly-Play, the only arcade game machine made in the GDR (East Germany). It imitates its colour palette and graphical style and also uses some of the original Poly-Play graphics, most notably the font. Numerous references to East German culture and politics are scattered across the game.