Pyramid Puzzle

Insert a number 1-9 in each vacant square so that the number in each square is the sum or difference of the numbers in the two squares immediately below it. Numbers in the similarly colored squares will be the same.

How to play: By default puzzle option is selected at the top. Select a sqaure in the grid and then click one of the number options to fill it. One additional option is there for clearing a square.

The other two options at the top are to add notes in a square. One for possible options for a square (in green text), and second for the possible exclusions for the square (in red text).