In PlayBits, Pebble users battle each other in a pattern-matching game with the help of their Bitlets (data daemons that fight for your honor). Bitlets are collectible sprites that you can earn via battling other PlayBits users in the BitletArena (the pattern-matching game).
PlayBits users utilize an inter-pebble connection (via an android app intermediary) in order to send each other their Bitlets for battle. Each round, they see the same sequence of button-presses, and the first one to recreate the button-presses incorrectly loses.
The winner gets a copy of the loser's sprite, and expands his collection of Bitlets.