Clear the board. Every level is made of tangled neon arrows. Slide them all off the board to complete the level.
Tap to release. Tap an arrow and it slides out the way it's pointing - only if that path is clear all the way to the edge.
Mind your hearts. A blocked tap costs a heart. Clear the outer arrows first to open room for the rest.
Stuck? Tap Hint to light up a free arrow, or Undo to take back your last move.