Play Dr. Sudoku Online

Dr. Sudoku came out in 2006 for the Game Boy Advance, published by Natsume. It was part of that late GBA period when puzzle games were still finding a solid audience on the handheld. You didn't see a huge amount of sudoku games on the system, so this one stood out simply by existing.

You don't control a character; you interact with the puzzles directly. The main objective is to solve a series of sudoku grids, filling in the numbers from 1 to 9 without repeating any in a row, column, or designated 3x3 box. The game includes a note-taking function, letting you pencil in possible numbers, and it offers multiple difficulty levels that change the number of pre-filled cells. The pacing is methodical, and the difficulty can get quite sharp on the harder settings. It feels like a quiet, focused test of logic that fits perfectly in your hands.