How to play
The rule
Count every rectangle whose numbers add up to the target.
- Blanks count as 0.
- One square is a rectangle too.
- Rectangles can overlap, but can't cross a gap.
- Each different rectangle counts once.
These 4 count (target 5)
These don't
How to answer
Scoring
- 3 guesses. Each wrong one adds 30 seconds.
- Only your first try is timed and ranked. Replays are practice.
- The game picks your next board: a little harder after quick wins, easier after a miss.
Levels
- Easy 3×3
- Medium 4×4 and up
- Hard odd shapes, negatives
- Expert fractions, decimals, giant boards
Tip
Find the single squares first, then grow them with blanks.