Light Up: Logic Puzzles Akari

Use logic. Light up every cell.

Light Up is a logic puzzle inspired by Akari, the classic Japanese paper-and-pen game — pure deduction, no luck, no guessing. Place a bulb in every right cell until the whole grid is lit. The satisfying part is the chain reaction: solve one wall and the next answer shows itself, board after board. Start small and work up to bigger grids — easy to pick up, tricky to master, and a good little brain teaser that leaves you feeling smarter.

If you love Sudoku, nonograms, or a good number puzzle, Light Up is your next logic puzzle.

HOW TO PLAY
• Place light bulbs on the grid. Each bulb lights its row and column until a wall blocks it.
• Light every white cell — and no two bulbs may shine on each other.
• Each numbered wall must touch exactly that many bulbs.
Every puzzle has one solution, and you reach it by logic alone.

WHY YOU'LL LIKE IT
• The chain reaction — solve one part and the next reveals itself, from the first bulb to a fully-lit board.
• Master the small boards, then take on the big ones. Easy to start, hard to master.
• A real workout for a sharp mind — pure deduction, one solution every time.

FEATURES
✓ 249 hand-tuned logic puzzles, from gentle beginner boards to genuinely hard
✓ Four board sizes — 7×7, 8×12, 10×15, and big 13×18 grids
✓ Three difficulties — Easy, Normal, and Hard
✓ Three helpful boosters — Hint, Auto-X, and +2 Hearts, there when you want them
✓ Mark the cells you've ruled out, and undo any move
✓ Solve at your own pace — the early levels are completely untimed
✓ A clean, large, easy-to-read board built for comfortable solving

New to Akari or a seasoned solver, there's a board here for you. Think it through, watch it light up, and feel a little smarter every time — the kind of logic puzzle you'll come back to.

Use logic. Light up every cell.