classic 9×9 sudoku — easy, medium, hard, expert — generated client-side with a unique-solution check. notes mode, hints, autosaved progress per device.
Sudoku-Bench
This leaderboard shows performance on the Sudoku-Bench reasoning evaluation dataset.
Opinion | How to Become a ‘Superager’ (Published 2016)
Sudoku isn’t enough. You have to push yourself.
Tupo · A daily sudoku-style logic puzzle with a twist
A simple logic puzzle of numbers and colors. One new puzzle every day, starting easy and getting harder through the week.
Murdoku
Play Murdoku: free printable logic puzzles where murder mystery meets Sudoku. New cases twice a week.
This Most Simple Sudoku Rule = Fog Magic
Hashiwokakero
Hashiwokakero is a type of logic puzzle published by Nikoli. It has also been published in English under the name Bridges or Chopsticks. It has also appeared in The Times under the name Hashi. In France, Denmark, the Netherlands, and Belgium it is published under the name Ai-Ki-Ai.
Times Tables — Learn, Play and Print the Multiplication Tables
Practise every times table from 1 to 12 with free games, speed tests, printable charts and worksheets. Works on phones, tablets and computers. No sign-up.
I trained a cellular automaton to write English, using no neural net at all
Each word or letter is written into a grid of integer cells. Learned rules rewrite the cells, and the next word is read from the grid. You can watch…
PaddlePaddle/PaddleOCR-VL · Hugging Face
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
Juju-chu!: The Jujutsu Guide for Agentic Coding
A hands-on book on adopting Jujutsu (jj) with Claude Code and Codex: automatic snapshots, undoable operations, and safe history rewriting.
Building a spreadsheet from the ground up | Prabhanshu Gupta
‘Best’ oracle system you use!
77 votes, 90 comments. Hey gang! Let me know what your favorite all time oracle system is that you use in the majority of your solo games. I’m…
Patrick's Parabox
Patrick's Parabox is a mind-bending recursive puzzle game about boxes within boxes within boxes within boxes.
Regnestykker
Sheets with calculus exercises suitable for kids that are learning the first basic arithmetic operations.