What a mess this is!
Wait patiently in the queue shown below.
Once in the game, you have 1 minute and 30 seconds to clean up the coffee shop by stepping on all of the trash highlighted below.
On both sides of the game area, gremlins will progress towards the trashbots. You must repeatedly keep sending the gremlins back by stepping on the corresponding arrow plates. If a gremlin reaches a trashbot, one of the pieces of trash you previously cleared up will respawn.
Once all the trash has been cleared, sit on either of the chairs highlighted below which will have spawned to receive your badge!