Sutwoku is a competitive Sudoku game for iPhone where players race against each other to complete the same puzzle at the same time. The objective is to get as many numbers right as possible to earn points. However, if a player guesses wrong, they will be blocked for 5 seconds and lose a point.

With a unique rating system, Sutwoku ranks players based on the number of games they have played and the opponents they have faced. For casual players, there is a Practice Game feature where they can play against a friend without affecting their rating.

The game also offers a variety of color schemes, allowing players to choose between light and dark UI designs.

Please note that Sutwoku currently only supports one level of Sudoku puzzles - Medium. However, the developers are planning to add more difficulty levels in the future, along with an improved ranking system and different multiplayer versions.

For more information, updates, and to provide feedback, you can visit the Sutwoku website or reach out to the developers on Twitter.