Which arrow goes first?
Clear the board one arrow at a time. Find an open path, work around blockers, and get to the bombs before their fuses run out.

Classic
Clear every arrow before you run out of hearts.
Tail bombs
Clear the arrow carrying the bomb before its fuse reaches zero.
Area bombs
Clear the arrows in the marked area before the bomb goes off.
Race a friend on the same boards in a one-, three-, or five-round match.