A Mac developer has released Su Doku live, a package of three games based on the popular Sudoku puzzle game featured in the games section of Apple's website. An online competitive arcade version of the game lets up to 32 players race against the clock, and enables them to view each other's progress in real-time as they solve puzzles. An Online cooperative version allows players to work together to solve puzzles in a relaxed atmosphere with chat capability, and usually consists of very difficult puzzles. The single player version is near completion, according to the developer, featuring a solver, a puzzle generator, player notes, and a hint system for beginners. The forthcoming version will include a tutorial that can teach users to solve every puzzle, help them through every challenge without resorting to "guessing," and explain well-known techniques. Su Doku Live is priced at $20 (system requirements were unavailable).