Sumstone - Mental Math Puzzle Game
Think fast, crunch numbers - inspired by Countdown
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.
Does the same job
all alternatives →- IMI made a puzzle game that gently introduces my favorite math mysteries2024 · rahulilango.com · ▲1,054
This is the first iteration of a short game I’m making that tries to interactively explain some of my favorite math questions / ideas. My goal is mostly to get the player curious and not necessarily to explain absolutely everything. There were a lot of fun technical parts to building this: - For implementation reasons, it’s much easier if the lines all have integer intersection points with each other. To do this, when a new line is added I “cheat” by rounding intersections to integers and then splitting the old lines at the intersection into new linds (with potentially different slopes)…
- IMI 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! :)
- IMI made a web game that makes practicing basic arithmetic fun2024 · worchle.com · ▲161
Hey, maker here. After launching a daily word search game, I randomly thought of this math game while driving. Finally got around to making it and I think it turned out pretty cool. It’s a math search game that’s meant to help you practice your quick addition, subtraction, multiplication, and division skills. I’m hoping it’ll help people (even those like me who aren’t big on math) learn and increase their speeds. (There are also some settings you can enable to make the game harder) If you try it out, please let me know if you found it fun, if you have anything you’d like me to add, or if you…
- IMI 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.
- DADozenal – 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…
- IMI made a tiny game to challenge your mind2024 · vidzert.com · ▲35
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Launched alongside, May 2026
the whole month →
Parallel agents, diff reviewer, and multi-model comparisons
Dev tools · May 2026 · kilo.ai
- NW
Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…
Life & fun · May 2026 · github.com
- FM
Dev tools · May 2026 · github.com