How to play

Thirty seconds, tops.

1. 1

   Read the row & column targets

   Each row and column has a target sum shown alongside the grid. Every game is a square grid sized between 6×6 and 10×10, and at least one row target and one column target will be 9 or less to give you a foothold.

2. 2

   Select or eliminate

   Switch between two modes. In Select mode, tap a cell to mark it as part of the solution. In Eliminate mode, tap a cell to rule it out. Tap again to clear.

3. 3

   Match every target

   The cells you select in each row must add up to that row's target — and the same goes for every column. Solve them all to win the round.

4. 4

   Mind your lives

   A wrong tap in either mode costs a life. You start each round with 2 lives. After you've completed 1,000 games, every new round starts with 3 lives.

5. 5

   Out of lives?

   Lose all your lives and you'll be offered the choice to replay the same puzzle or move on to a new one.

6. 6

   Climb the leaderboard

   Your nickname colour on the leaderboard upgrades as you complete games: black → bronze (100) → silver (500) → gold (1,000) → diamond ring (5,000).