🧮 Cross Sum

PlayRulesScoresSettings
How to Play Cross Sum
Remove only extra numbers and match all row/column sums

Objective

Each puzzle starts with a full number grid. Your task is to remove extra numbers so that every row and every column reaches the target sum shown on the right and bottom.

Difficulty Sizes

  • Easy: 5×5 grid
  • Medium: 6×6 grid
  • Hard: 7×7 grid

Lives

You have 3 chances. If you click a number that should not be removed, you lose one chance. Losing all 3 chances ends the game.

Controls

  • Left click: remove a number
  • Right click: highlight a number you want to keep
  • Rows/columns auto-mark as complete when sums match

Completion State

A row or column is marked complete automatically when its active numbers match the expected sum.