How to play
The numbers beside a row (or above a column) are the lengths of the runs of filled cells in that line, in order, with at least one empty cell between runs. 3 1 on an 8-wide row means three filled cells, a gap, then one filled cell, somewhere in the row. Start with lines where the clues nearly fill the line (an 8-wide row with 6 has its middle four cells filled whatever the position), mark cells you know are empty with ✕, and alternate between rows and columns. Every puzzle here is solvable without guessing; if you are stuck, there is always a line that yields at least one cell.
The hex part
Read a finished row as binary, filled = 1, left to right: 01111110 is 0x7E. The whole 8×8 picture is eight bytes, which is exactly how 8×8 fonts, icons and sprites were stored on 8-bit machines and still are in embedded displays. The share text for a solved puzzle is those bytes. In hex mode the game shows the bytes and you paint them, which trains the nibble-to-four-bits reflex (7 = 0111, E = 1110) that makes reading hex dumps fast.
Solving technique
- Overlap. Push each run as far left as it can go, then as far right; cells covered in both positions are filled.
- Edges. A filled cell at the edge of a line extends the first run fully; an empty cell next to a complete run closes it.
- Counting. If the clue adds up to the line length minus the gaps, the line is determined.
- Cross-checking. A cell empty by a column clue is empty for the row too; most progress comes from switching direction.
Questions
Is every puzzle solvable without guessing?
Yes. The built-in pictures and the random practice grids are all checked with a line solver before they are shown; anything that would need a guess is discarded.
How do I mark a cell as empty?
Right-click, or switch the tool to ✕ and click. On a phone, use the ✕ tool. Marks are for your own bookkeeping; the puzzle is solved when the filled cells match, whatever you marked.
Can I drag to paint?
Yes, press and move across cells in a straight line; the first cell decides whether you are filling or clearing.
What are the 16×16 pictures?
Larger sprites: a space invader, a floppy disk, a rocket and others. Their rows are 16-bit values shown as four hex digits.