Sum Fun

Train your brain, boost your math skills, and have fun along the way!

If you enjoy Sudoku, Kakuro, or other number-based puzzles, you’ll love the unique twist of Sum Fun.

Sum Fun combines logic, numbers, and strategy into endlessly replayable puzzles that have been delighting players of all ages for the last decade!

Whether you want a relaxing break or a mental workout, Sum Fun has you covered with a variety of creative board shapes, including:

Hexagon • Square • Pyramid • Star • Heart • Turtle • Snowflake … and many more!

How To Play: (aka the 3 simple rules for Having Sum Fun):

1. Place a number into any empty slot
2. If it matches the last digit of the sum of its neighbors, they get blasted away!
3. No matches? Place a number that sets up a future sum, and keep blasting until the board is empty!

Why you’ll love Sum Fun:

• Easy to play, fun to master – simple rules, with a variety of depth and strategy

• Brain-boosting gameplay – by the time you’ve played a few times, you’ll be adding up numbers faster than you can say, ‘What’s six plus eight?’

• No time limits – play at your own pace and relax while keeping your mind sharp

• Challenge friends (and yourself!) – share puzzles and see who can win in fewer moves! No internet needed: share games via QR code, text code, or simply pass-and-play.

• No annoying pop-up ads – just banner ads and optional rewarded ads for extra content. No ads unexpectedly popping up and breaking your concentration while you figure out how to close them! Best to spend that mental energy playing a game you love!

Exercise your mind, master the numbers, and discover why Sum Fun has been loved world-wide for over 10 years!

Recent changes:
We've added an extra dose of fun to your day, with our new Daily Challenges!

Finish 3 puzzles within the required number of moves, and unlock a special bonus game!

Plus:
• Play our new Halloween shapes including Pumpkin, Cat, Hat, and Bat!
• Collect unique artwork inspired by our travels in our Postcard Challenge
• The Beginner shape collection has expanded, including Pine Tree and Egg