The Koala's Tap-Tap Rhythm

コアラのとんとんリズム — Koala's ton-ton rhythm — is a music-flavored browser game with a Japanese title whose imagery is adorable upfront: a koala keeping the beat to a ton-ton rhythm. The official page offers no further detail, but the game is free, needs no download or install; open the page and jump into the rhythm with the koala.