Anime: Chibi Kero: Kero Ball no Himitsu!?

Back on the planet Keron, a young Keroro tries to impress Pururu by showing off the Kero Ball, a multifunctional Keronian weapon borrowed by Giroro from his brother Garuru. While testing the buttons, Keroro accidentally transports himself, Pururu, Giroro and Dororo inside the ball, where the four end up in a large-scale pinball simulation.

— written by Singan

Note: a short 17 minute full 3D CGI movie double billed with Chou Gekijouban Keroro Gunsou 2 Shinkai no Princess de arimasu!.