Yes, completely — no purchases, no paywalls.
No, not for solo play — just hit Start Game. Setting up a profile is only needed if you want to appear on the global leaderboard or play with friends.
Yes — use the pause button during a game and resume whenever you're ready, as long as you keep the tab open.
Up to 5 per puzzle. Go over that and the puzzle ends.
Each puzzle gives you a limited number of hints. Using one reveals the correct number for a cell of your choice.
No — multiplayer rooms, friends, and the leaderboard are all free.
We'd love to hear it — see the Contact link on the home screen.
Ready to play? Start a puzzle →