iQiQGame Sudoku

iQiQGame Sudoku is a free browser sudoku game built for quick daily mental workouts with no download, no account and no paywall. Pick from more than ten sudoku variants, including classic 9x9, 4x4 and 6x6 grids, killer sudoku with cage arithmetic, kropki dots, arrow sudoku, diagonal sudoku and irregular jigsaw layouts. Every puzzle is generated on the fly, so you can play unlimited rounds at any difficulty instead of waiting for a single daily grid. Beyond sudoku, iQiQGame hosts a whole library of brain-training games: the 24-point number game, memory matching, sequencing, reaction-time drills, perception tests and logic puzzles. Each game runs instantly in the browser on desktop or mobile and takes about five minutes to play, making it perfect for a coffee break or a daily cognitive warm-up.