iQiQGame - Free Online Number Puzzles & Brain Training

iQiQGame is a free, browser-based collection of number puzzles and cognitive training games. There is nothing to install and no account is required: every game loads directly in the browser and works on desktop and mobile.

The library currently focuses on three areas:

• Sudoku - classic 9x9 logic puzzles with several difficulty levels, plus daily challenges. Play sudoku online

• Number puzzles - including the 24-point game, where you combine four numbers with basic arithmetic to reach exactly 24. Play the 24 points game

• Memory and logic - matching pairs, pattern recognition and deduction exercises. Browse all number puzzles

Each puzzle page also records your completion time and accuracy, so you can track whether a given type of training is actually getting easier over a few weeks rather than just guessing.

The project is built with Nuxt and Vue and is intentionally lightweight - the goal is for a puzzle to be playable within a second or two of opening the page, even on a slow connection.