You are partway through a puzzle. Unisu does not insert an ad. The current app has no banners and does not require a video ad before a hint.
What you use instead
The app offers the classic grid, your own pencil marks, explained hints and lessons. The focus stays on the move you are trying to understand. This website introduces the app; download it to play.
Ad-free and free are different questions
The current version has no in-app purchases. Ad-free describes the playing experience. The store lists the price and contents of the available version.
Play without a connection
Puzzles and lessons are stored locally in the installed app. The offline guide explains what works locally and what still needs internet.
