Zen of Sudoku

Zen of Sudoku launched on December 14, 2006 as a self-contained casual puzzle game. The store description presents it as a complete product with a fixed feature set: hand-painted backgrounds, unlimited puzzle generation, printable puzzles, custom puzzle entry, and unlockable trophies. There is no mention of planned DLC, updates, or ongoing content. The only developer communication on record is a November 24, 2018 post in which Unknown Worlds acknowledged they had neglected this Steam Community group for eight years — the previous post had been in January 2010. The 2018 post was a general studio retrospective celebrating their journey and thanking their community; it contained no announcements or plans related to Zen of Sudoku itself. The studio's focus has clearly moved on to their later titles (Natural Selection 2, Subnautica). No DLC has ever been listed for the game, no post-launch updates have been documented, and no future content has been announced at any point in the game's nearly 20-year history. Zen of Sudoku shipped as a finished product in 2006 and has remained unchanged.