Sudoku Stargazer: Classic

Collect night-sky constellations with classic Sudoku, the number puzzle everyone knows. Every puzzle you solve lights up one star. When you've lit every star in a constellation, a hand-drawn-style constellation card arrives and you move on to the next one. Orion, the Big Dipper, Cassiopeia, Cygnus, Gemini… collect all 16 constellations. ■ Classic Sudoku · 4 levels: Easy, Medium, Hard, Expert · Every puzzle has exactly one solution and is built to be solved by logic, with no guessing · Notes (candidate numbers), auto-fill notes, and automatic removal of notes in the same row, column and box when you place a number · Same-number highlighting, row/column/box highlighting, and a remaining-number count · Unlimited undo and erase ■ Hints That Explain Why Hints don't just give you the answer. They show you the next cell and the reason, like "This is the only place in this box where a 7 can go" or "Only 4 and 9 can go in the two marked cells (a pair)", so you get better as you play. 3 free hints per puzzle. ■ Twin Worlds A new kind of Sudoku in which two puzzles are linked through a few cells. Two cells marked with the same color hold the same number. You can't solve either puzzle by looking at it alone, so move back and forth between the two worlds to find clues. As you level up, more cells are linked and the puzzles get harder. ■ Daily Challenge Every day, everyone plays the same puzzle. It gets harder toward the weekend, and clearing it earns you one more star. ■ Play Your Way · 3-mistake limit, wrong-number highlighting, and timer display can be turned on or off · Large number mode · Night Sky, Paper, Dawn, Forest, Rose, Deep Sea, and Golden Board themes (unlocked as you collect constellations) · Win rate and best time records for each difficulty You can play without an internet connection. Supports 한국어, English, 日本語, 繁體中文, and Deutsch. Ads and purchases: There is a banner ad at the top of the screen, and interstitial ads may appear between puzzles. Rewarded ads (3 hints, continuing after a mistake) are shown only when you choose to watch them. You can purchase a monthly "Starlight Club" subscription (no ads, unlimited hints, 2x stars, exclusive themes) and hint packs. You can cancel your subscription at any time in Google Play.

Added a 'Contact & Report a Bug' button in Settings. If something goes wrong, tap it to let us know. Stability improvements.