Chain Reaction

Chain Reaction is a minimalist puzzle about setting off the perfect cascade.

The board is full of reactors. Each one fires along its arms when a beam hits it: some shoot in all four directions, some only up and down or left and right, and some bend around a corner. Place a few triggers, press Fire, and watch the chain race across the grid. Light every reactor in one continuous cascade to win. Blockers absorb beams, and decoys end the run if anything touches them.

Every board has a par, the fewest triggers that can solve it. Match par for three stars.