Sum Master

Sum Master is a challenging and engaging math game with lots of difficulty levels to choose from. Can you circle the right numbers so that all the sums add up?

It’s like a nonogram, but with numbers! You can use this fun game to practice your mental math skills! 

Work your way up from the easiest to the hardest math puzzles.

How to play Sum Master - Number Grid?

This math game is just like a picross or nonogram puzzle, but with sums. Look at the numbers listed along the top and the right side of the grid. The aim is to circle the numbers inside of the grid that will add up to exactly that number.

In the later levels, groups of blocks will also have different colors. Inside of each group, you’ll see a small number. The numbers you circle inside of that group will also have to add up to the small number exactly. This way, you should be able to work out each puzzle using logical calculations only (and no guessing).

Tools:

At the bottom of the screen, you’ll see a pencil and an eraser. Use the pencil tool to circle the numbers, and switch to the eraser to remove numbers you can eliminate.

You have three lives (hearts). Each time you circle or erase a wrong number, you lose one heart. 

Difficulty Level

You can scale the game to be as easy or difficult as you like. The easiest levels have a 5-by-5 number grid, while the hardest levels feature a 9-by-9 grid.

Solution Example: 

Try looking for smaller numbers to figure out the first couple of answers. For example, if the number at the top of the first column is 5, and the numbers in the column are 2, 6, 3, 8, 7 then there is only one possible answer: 2 and 3 add up to five. You can then erase the remaining numbers in that column, since circling any of them will bring the total within the column above 5.

Play more free online games like Sum Master

If you like puzzles with numbers, check out our collection of math games, or try your hand at our logic games.

Who created Sum Master?

Sum Master was created by BestGamesFreePlay.

When was Sum Master first released?

This game was first released on June 16, 2025.