Fill the number pyramid so each brick equals the sum of the two bricks below it.
How to Play
Each brick equals the sum of the two bricks directly below it. Some bricks are already filled in (blue) — use them to work out every blank brick. Taller pyramids mean more rows and harder deductions.
Controls
Click a blank brick and type a number. Use Tab or the arrow keys to move between bricks. Given bricks can't be edited.