How to play Numlock

• Tap a number to strike it out — tap again to restore it.
• The remaining numbers in each row and column must add up to the target shown at the right and bottom edges.
• A target lights up when its sum matches. Match them all to win.
• Your time starts on your first tap; unlimited undo, no penalties.

FAQ

Is there a new puzzle every day? Yes — one worldwide puzzle at midnight UTC. Monday starts easy at 5×5, mid-week is 6×6, and weekends bring 7×7 grids with negative numbers.

Does every puzzle have a unique solution? Yes. Every daily grid is verified to have exactly one solution, solvable by pure logic with no guessing.

Can I play more than once a day? Practice mode offers unlimited puzzles; practice games don't affect your streak or stats.

Is Numlock free? Completely free — no sign-up, no paywall, no interstitial ads.