How to Play Number Pyramid
1. The Rule
Each cell equals the sum of the two cells directly below it.
2. Fill in the Blanks
Click a blank cell to select it, then type a number using the numpad or your keyboard.
3. Check Your Work
Press the Check button to see which cells are correct (green) or incorrect (red).
4. Difficulty
Choose Easy, Medium, or Hard to change the pyramid size and number range.
5. New Puzzle
Press New Puzzle any time to get a fresh pyramid at the current difficulty.