# Murder Sudoku > A murder mystery logic puzzle: place every suspect on the floor plan, one per row and column, and unmask the killer. Play Murder Sudoku free online: a detective sudoku and murder mystery logic puzzle. Place suspects using clues and unmask the killer. Unlimited cases. - Play: https://mogame.app/en/games/murder-sudoku/ - Genre: Puzzle - Price: free, no ads, no sign-up, no download - Platforms: desktop, mobile (web browser) - Controls: keyboard, mouse, touch - Online leaderboard: yes - Released: 2026-10-05 - Last updated: 2026-10-29 ## How to play Someone has been murdered in the mansion, and every suspect is still somewhere on the floor plan. Your job is to work out exactly where each person — and the victim — is standing. Like sudoku, there is exactly one person in every row and every column. Nobody can stand on a table, bookshelf, piano or plant, but people can sit on chairs, beds and rugs. Each person has clues such as “Rosa is in the Kitchen”, “Hugo is next to a piano” or “Ivy is somewhere above Otto”. Combine the clues with the row and column rule to place everyone. The killer is the only suspect who is alone in a room with the victim — when the board is complete, the culprit is revealed. Pick a person in the cast bar, then tap a cell to place them; tap them again to pick them up. Long-press or right-click a cell to mark it with ✕ as a reminder that nobody can be there. Every case is generated and checked by a solver to have exactly one solution, reachable by logic alone. Cases come in Easy 6×6, Medium 7×7 and Hard 8×8, and you can play as many as you like — each size has its own leaderboard for the fastest solve times. ## Controls Mouse or touch: pick a suspect at the bottom, tap a cell to place them, tap a placed person to select or remove them. Long-press or right-click marks a cell with ✕. Tap a clue to cross it off. Keyboard: arrow keys move, Space or Enter places the selected person, 1–9 select a person, X marks ✕, Backspace clears, Z undoes, H gives a hint. ## Tips - Start with clues that pin a person to one room or one row — they cut the board down fastest. - Use the row and column rule constantly: once someone is placed, their whole row and column are closed to everyone else. - The victim’s room holds exactly one suspect. If two people must share a room, the victim can’t be there. - Someone who is “alone in a room” rules out their whole room for everyone else. - Hints place one person correctly but add 30 seconds to your time, so try a few deductions first. ## Frequently asked questions ### What is Murder Sudoku? Murder Sudoku is a murder mystery logic puzzle. Like a sudoku, every row and column holds exactly one person; clues about rooms, furniture and positions tell you where each suspect stands, and the suspect alone with the victim is the killer. ### Is Murder Sudoku free? Yes. It is completely free, runs in your browser on phone and computer, and needs no download or sign-up. ### Does every case have only one solution? Yes. Every case is generated with template clues and checked by a solver to have exactly one solution, and by a step-by-step deduction solver so you never have to guess. ### How does the leaderboard work? Each size — Easy 6×6, Medium 7×7 and Hard 8×8 — has its own leaderboard. Every time you close a case you can submit your solve time: lower is better, and each hint adds 30 seconds. There's no limit on cases: after a solve, tap Next case to start a fresh case of the same size right away. ### What do the difficulty levels change? The board size: Easy is 6×6 with five suspects, Medium is 7×7 with six and Hard is 8×8 with seven. Bigger houses mean more rooms, more clues and more deductions. ### Is my progress saved? Yes. Your current case, placements, ✕ marks and timer are saved in your browser, so you can close the page and pick up where you left off. Your best time for each size is kept too.