Buy MoonDoku: Sudoku Nights PC key

MoonDoku: Sudoku Nights is a Sudoku game built around a nightly routine at an observatory. Solve the Nightly Sudoku to earn a star for your sky; as you return, your stars gradually form constellations. A cat keeps you company, while you can change the view beyond the window and set the room’s music and ambient sounds.

Nightly Sudoku

Everyone gets the same Nightly Sudoku each night. Each constellation takes 7–12 nights to complete, with four constellations to choose from each month. Stars you earn stay yours, and missing a night simply pauses your progress. A puzzle completed after midnight still counts for the night you started it, and stars earned under a full moon shine brighter.

Puzzle collection

The game includes 5,000 additional Sudoku puzzles: 1,500 Easy, 1,500 Medium, 1,250 Hard and 750 Expert. Puzzles do not repeat until you have exhausted a difficulty, and each has one solution that can be reached through logic alone. Easy and Medium introduce the puzzles, Hard is more demanding, and Expert uses techniques such as pointing pairs and subsets.

You can add up to nine pencil-mark notes to each square, with every note in its own position; notes are never checked. Each number is checked as you enter it: correct answers lock in and clear that number from notes in the same row, column and box, while mistakes clear themselves. On the Nightly, each mistake adds 30 seconds to your time; on endless boards, the clock does not affect your score. The game explains your first mistake and gives each board one to three hints, depending on difficulty.

The observatory cat

Between puzzles, the cat sits on the observatory’s window ledge. While you play, it wanders along the top of the Sudoku board and watches your moves; if left alone long enough, it falls asleep where it is. You can pet it, or change its coat with a right-click or click-and-hold. There are eight coats, including a plush gray Chartreux and a longhaired Ragdoll. The cat winces when you make a mistake and gives a slow blink after twelve correct answers in a row.

Change the night

Ten worlds provide different views beyond the observatory window, including drifting cherry petals, rain, fireflies and shooting stars. Change the view with the brass arrows beside the porthole or the bracket keys; the Sudoku remains the same while the scenery changes.

MoonDoku FM has three stations: Chillhop, Bossa Nova and Downtempo. You can mix in rain, a cozy café, a crackling fireplace, ocean waves or a distant storm, adjusting each sound’s volume. The game works offline. Press F for Focus to fade out the room while the music continues.

Additional features

• 5,000 included Sudoku puzzles are stored on your drive and work offline without an account. The Nightly Sudoku comes from the server and requires an internet connection.
• Steam Cloud carries your sky, streak, cat’s coat and unfinished puzzle between machines.
• Play with a keyboard, mouse or controller. You can enter numbers directly, click the 3×3 pad beside the board or use a controller’s 3×3 picker.
• There are 17 achievements, from completing your first Easy puzzle to reaching a thirty-night streak.
• An optional free account lets you compare your Nightly time after each solve by signing in with an emailed code.