Chapter 1: First picture
5×5 In progressA clue as long as its line fills the whole line.
Chapter 2: Cross it out
5×5 Sign inWhen a line has all its filled cells, cross out the rest.
Unlocks Medium in free play
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Chapter 3: Meet in the middle
10×10 Sign inA long run always covers its middle cells, wherever it slides.
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Chapter 4: Start at the edge
10×10 Sign inA filled cell near an edge must be part of the line's first run.
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Chapter 5: Mix it up
10×10 Sign inUse the middle and the edges together.
Unlocks Hard in free play
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Chapter 6: Join and split
15×15 Sign inWork out whether filled cells belong to one run or two.
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Chapter 7: Every way it fits
15×15 Sign inTry every way the runs fit; cells that always agree are certain.
Unlocks Expert in free play
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Chapter 8: Master pictures
15×15 Sign inEverything you've learned, on the biggest pictures.