Sudoku: Nine Circles

Sudoku with a boss on the board. Nine levels. Nine bosses. Each one sits on the grid while you solve it. They erase your pencil marks, occupy cells, scramble digits, deny you a number, arm a cell with a fuse, or chip away at a given until it is gone. STORY MODE Descend nine circles. Clear a level to unlock the next. Earn up to three stars a fight for time, hints and mistakes. QUICK PLAY Pick a difficulty and go straight to a grid. No bosses. FIVE DIFFICULTIES Easy, Medium, Hard, Expert and Genius Mode. Difficulty is separate from level: any boss at any difficulty. Genius Mode is for people who solve for sport. CHALLENGES A new puzzle every day, a streak to keep, and rewards for coming back. LEARN Twenty-three solving techniques, from singles to Swordfish and beyond, each shown step by step on the board, with endless practice drills. Hints name the technique behind the next step, so you learn it instead of just filling a cell. BUILT TO BE PLAYED BY EVERYONE Three colorblind palettes, large text that follows your system size, bold text support, high contrast, reduced motion, board coordinates, haptics, full screen-reader labels, and hardware keyboard support. PLAY ANYWHERE Fully playable offline. Sign in with Google if you want your progress on another phone; you never have to. Free to play, supported by ads. Every level can be finished without paying.