Cipher Grove2–5 min
Sudoku
Sudoku turns a compact set of clues into a satisfying chain of deductions.
Killer Sudoku
Killer Sudoku turns a compact set of clues into a satisfying chain of deductions. Read the board, rule out contradictions, and commit only when every clue supports the move.
KI
Ready when you are
Killer Sudoku
Complete the 4×4 Sudoku using digits 1–4 once per row, column, and box while also satisfying the small cage totals.
No sign-up · Saves on this deviceHow to play
Small rules. Plenty to master.
Killer Sudoku turns a compact set of clues into a satisfying chain of deductions. Read the board, rule out contradictions, and commit only when every clue supports the move. The scoring system rewards deliberate streaks rather than frantic random input. Questly keeps the familiar rules intact while adding accessible controls, three friendly difficulty settings where an opponent is needed, personal bests, and a crisp original visual treatment. A typical session lasts three to eight minutes, works comfortably with touch or keyboard, and saves progress without requiring an account.
01
Learn the move
Complete the 4×4 Sudoku using digits 1–4 once per row, column, and box while also satisfying the small cage totals.
02
Build a run
Pause before committing when the board changes.
03
Beat your best
Short, consistent streaks score better than risky guesses.
Controls & accessibility
Controls: Touch, pointer, and keyboard. The game supports reduced motion, color-independent cues, clear focus states, and a touch-first layout.
Frequently asked
Do I need an account?
No. Play instantly; an account is only needed to sync progress.
Does it work on mobile?
Yes. Every launch game is designed and tested for touch.