Goal

The numbers beside each row and above each column are its runs of filled squares, in order: "3 1" means three filled squares, at least one gap, then one more. Fill every square of the picture to reveal it — as many pictures as you can in 60 seconds.

How to play

• Fill fills squares; Cross marks squares you know are empty. Drag to do several at once.
• Every tap is checked at once. A wrong one is put right for you, but costs points.
• You never have to guess: every puzzle can be solved by reasoning one line at a time. A finished line's clue fades.

Levels and scoring

2 pictures with at most one mistake move you up; 2 pictures in a row with three or more mistakes move you down. The grid grows from 5×5 to 8×8; on levels 1, 3, 5 and 7 a finished line crosses out its other squares for you. A right fill earns 1 + half the level, a finished picture 5 + 2 × the level, and a mistake costs 2 + the level.

Logical Deduction

Each line narrows the others. Combining clues — "this square must be filled whichever way the run sits" — is careful, step-by-step deduction.