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Life & fun · May 14, 2026

Sumstone - Mental Math Puzzle Game

Think fast, crunch numbers - inspired by Countdown

Sumstone - Mental Math Puzzle Game launched on May 14, 2026 with 2 votes, #6,288 of 20,538 launches that month.

Visit sumstone.app ↗Alternatives

What it does

Six numbers. One target. Can you crack it? Sumstone is a number puzzle inspired by the Countdown game show. Combine six numbers using addition, subtraction, multiplication, and division to reach the target, or get as close as you can before time runs out. DAILY PUZZLE A new challenge every day, the same for every player. Difficulty rises through the week, from Easy on Monday to Expert on Sunday. Share your score, compare with friends, and build your streak.

Sumstone is a free daily numbers puzzle game. Use arithmetic to reach the target number from six tiles. A new challenge every day.

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  • I made a little math game named Summle2022 · summle.net · ▲189

    I made this game for my children to play, as they are heavily into Wordle, and I thought they'd also like something maths based! Every puzzle is solvable and has at least one solution (usually more). There is a kids mode in the settings, plus a hard mode for extra difficulty.

  • Countle2022 · countle.org · ▲152

    Countle is a daily puzzle game, a la Wordle, where you use 6 given numbers to produce of a sequence of calculations to reach a target number. In other words, it's a daily round of the "Numbers Game" from the British game show Countdown. Sample numbers round: https://www.youtube.com/watch?v=pfa3MHLLSWI A new puzzle appears every day!

  • I made an interactive math crossword puzzle with infinite levels2024 · scientific.place · ▲165

    Hey there! I'm the brains behind the math crossword game on my site. This game is all about making math a little more fun – users just drag and drop numbers to fill in the blanks and move on to the next level if they get it right. Let me know if face any issues or have any suggestions! :)

  • Sumplete – A logic puzzle game invented by ChatGPT2023 · sumplete.com · ▲27

    Solve today’s 5x5 Sumplete grid in under 5 minutes. Delete numbers until each row and column hits its target sum. Track streaks, compare stats — play free on any device.

  • I made a math puzzle game. Hope you like it2025 · madmonk13.github.io · ▲35

    I've been playing with this for quite some time and I think it's finally ready for public consumption. All feedback welcome.

  • Dozenal – A Game of Spatial ArithmeticJul 2026 · dozenal.game · ▲16

    Hello HN! We're Rory and Chris, and we've made a game called Dozenal[0], a grid-based number puzzle game where the objective is to use all the tiles on the board to create totals of 12 (hence the name). We think the mechanic is quite unique, although keen to hear if people know of similar games! You essentially drag tiles across the board, and the distance between two numbers decides the arithmetic operation when they connect to each other: zero spaces is addition, one space is subtraction, two spaces is multiplication: e.g. 5 → 4 = 9 5 → _ → 4 = 1 5 → _ → _ → 4 = 20 We've spent the past…

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