How to play
- Read the numbers beside each row and above each column: they are the runs of filled squares, in order.
- Tap or drag to fill squares, and switch to Mark to cross out squares you know are empty.
- Finish the picture to meet the creature hiding in it, and new creatures move into your Codex.
- Solve Today's creature each day, or open Practice and pick a 5×5, 10×10 or 15×15 grid.
Controls
- Touch
- Tap or drag to fill; switch to Mark to mark empty squares
- Mouse
- Click or drag to fill, right-click to mark empty squares
- Keyboard
- X or M switches between Fill and Mark, Backspace or Ctrl+Z undoes, P or Esc pauses
Tips
- If a line's only clue is more than half its length, its middle squares must be filled.
- A clue of 0 means the whole line is empty, so mark every square in it right away.
- A clue dims when its line matches, so bright clues show you which lines still need work.
- Each puzzle gives three hints; a hint fixes one square for you but adds 15 seconds to your time.
For parents
Ages 7+Parents: A new puzzle every day, plus practice grids.
- No ads and no purchases
- No chat and no accounts
- We collect no personal data
- Progress is saved only in this browser


