Number Sum Game: Logical Addition Puzzle

Mark all of the numbers needed so that marked numbers add up to needed target sums. The target sums for the columns are at the top of each column while the target sums for the rows are to the left of each row. Use logic and the eraser to eliminate numbers that can't add up to the target sum to help finding the needed numbers easier. 50 levels to complete without any time limit. You have 3 lives on each level so that you can make 3 mistakes and still complete each level.

Toggle the pen and eraser icon at the bottom of the screen to switch between Pen Mode and Eraser Mode. Pen Mode will allow you to circle the numbers that are needed. Eraser Mode will allow you to erase numbers that aren't needed. Just click on a number in Eraser Mode to erase the number. Clicking on a number in Pen Mode will circle that number.

A level is complete when all of the numbers are circled that add up to all of the target sums. Once a level is completed, you can drag the Level Complete panel if you wish to see the completed gameboard hidden underneath. On later levels some of the boxes will be colored. The superscript number in each different color identifies the total for that color. This can help you determine which numbers are needed.

If you need help playing you can always click on the Video button on the main menu to see a video on how to play as well as a few game tips.