Sum Stacker

  Sum Stacker is a number puzzle game about balance — stack digits, clear lines, and keep your board under control.

  How to play:

  - Drag pieces from the tray onto the 6×6 grid

  - Each piece carries digits (1–9)

  - When a row or column sums to 28–32, it clears and scores points

  - Clear multiple lines at once for a combo bonus

  - Watch out — if a line exceeds 32, those cells lock up in red

  - The game ends when no piece can fit on the board

  Tips:

  - Plan ahead — a locked row blocks future pieces

  - Set up combos by clearing multiple lines at once

  - When the board gets crowded, small pieces can be lifesavers

  Simple to learn, tricky to master. How high can you score?