Über uns
A crowd of color-coded characters waits at the stop; tap one to send it toward the docked bus. Match the bus's color and it boards; anything else waits on a bench with limited seats. Fill and depart the docked bus to bring in the next one — any bench riders matching its color auto-board in a cascade. Board everyone to clear the level; a full bench with no match on the docked bus ends the run. The level you reach feeds a shared leaderboard.
Puzzle