Leadlight: Math Logic Puzzle

Fill the stained-glass window with digits. Every row and every column holds each digit once, and the digits of every lead-framed cage add, subtract, multiply or divide to the number in its corner. Reason it out, and watch the light pass through the finished window. 280 puzzles, each with exactly one solution you can reach by logic alone.

Support

Found a bug, stuck on a purchase, or have an idea? Email [email protected] – please include your phone model and, for a puzzle question, the difficulty and level number.

Frequently asked questions

How do I write a digit?

Tap a cell, then a digit on the pad. Tap the same digit again to clear it. Switch on the pencil to write small notes instead. With Auto-clear notes on (Options), a digit removes itself from the notes in its row and column.

What do the operations mean?

12+ means the cage's digits add up to 12, 24× that they multiply to 24. A 2− cage holds two digits that differ by 2, a 3÷ cage two digits where one is three times the other. A digit may repeat inside a cage when the cells are not in the same row or column. Expert windows show only the target: working out the operation is part of the puzzle.

I bought a pack but the levels are still locked.

Open any locked level to get to the Purchases page and tap Restore Purchases. Make sure you are signed in to the store with the same Google or Apple account you used to buy it.

I got a new phone. Is my progress saved?

Purchases are tied to your store account and can be restored on any device. Your progress and best times are stored only on the phone you played on and are not synced.

Do I ever need to guess?

No. Every puzzle has exactly one solution and can be solved by logic. If you are stuck, the Hint button first shows where to look, then explains why, and only then makes the move.

What do the free and paid levels include?

All 40 Easy levels (with a short tutorial) and the first 10 levels of Medium, Hard and Expert are free. The rest come in one-time packs of 35 levels, or all at once. There are no ads and no subscriptions.

What data does the app collect?

Only anonymous gameplay statistics and crash reports, and you can switch them off in Options – see the privacy policy.