Each arrow carries a number and points in one of four directions. Only arrows with no blocker in their path can fly out. An arrow exits through the math gate on that edge (add, subtract, multiply) to produce a result. If the result matches the current target number, the arrow is removed and a new target appears. Wrong picks count as mistakes. Clear every arrow to finish the level.
Pick a free arrow, send it through an edge math gate to match the current target