Modern Sudoku is a free online number puzzle game that reimagines the classic Sudoku format with 20 unique boxes instead of the traditional 9x9 grid. Your goal stays familiar – fill every box with the correct missing numbers – but the fresh layout and sleek gradient visuals make this feel like a completely different challenge worth solving.

The game features modern input fields that make entering numbers quick and clean, so you spend less time wrestling with controls and more time actually thinking. Each puzzle tests your ability to spot patterns, eliminate possibilities, and commit to logical deductions. Get it right and you hit the win screen; get stuck and the retry option lets you jump straight back in without friction. The pacing is faster than traditional Sudoku, which keeps sessions short but satisfying and pushes you to sharpen your reasoning with every attempt.

Modern Sudoku is a solid pick for casual players looking for a quick brain workout during a break, as well as dedicated Sudoku fans curious about a non-standard grid format. If you enjoy free logic puzzle games, online number games, brain training games with no download, or casual puzzle games you can play in your browser, this one checks every box. It runs instantly in any browser, costs nothing, and delivers a genuinely different take on one of the most popular puzzle formats ever made.