
GridSum
iOS Game, Puzzle, Math
What it does
I've been obsessed with logic puzzles for years, so I built one. GridSum: a 7×7 grid of numbers. Each row and column has a target sum at the edge. Select which cells add up to it. One solution. Pure logic. No guessing. ✅ Free ✅ Daily puzzle (fresh every day) ✅ 20 puzzle packs if you want more ✅ No forced ads, no pay-to-win If you like Sudoku, Kakuro, or anything that makes your brain work — give it a shot. 👇 iOS: https://apps.apple.com/us/app/gridsum-math-puzzle/id6762402160
Does the same job
all alternatives →- FIFigure is a daily logic puzzle game2022 · figure.game · ▲417
Hello, HN! Figure is a little side project I’ve been working on. Someone described it as Bejeweled meets Wordle. I built the puzzle interface and website in Next.js and React, which was a first for me and overall a great learning experience. The daily puzzle data is queued up in a PostgreSQL table. Another table stores anonymous solve stats. Once a day, a cron job hits a serverless API that promotes the next puzzle as “live” and prompts Next.js to update the prebaked static site with the new data. The game state is managed with Redux and your stats are persisted to localStorage. Framer…

- PGPerfect Grid – my first iOS numbers puzzle game2014 · itunes.apple.com · ▲20
- CACorral – A Visual Logic Puzzle About Enclosing Numbers2025 · mohammed321.github.io · ▲26
Hey HN! I just finished building a puzzle game called Corral, and I’d love to share it with you. It’s a logic puzzle played on a rectangular grid, where some of the cells contain numbers. Your goal is to mark which cells are inside a single continuous loop that encloses all the numbers. For each numbered cell, the number tells you how many cells are visible in the four orthogonal directions (up, down, left, right) until a wall of the loop is hit, plus the cell itself. So a cell with a 2 must see one empty cell before hitting the loop boundary. Gameplay is all about deduction: you can mark…


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Launched alongside, May 2026
the whole month →

Parallel agents, diff reviewer, and multi-model comparisons
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- 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…
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