Feels like more of a proof of concept than a game. It's more efficient to randomly click for resources than to actually play sudoku (in fact, you're encouraged to do so because one of the achievement tracks is number of failed puzzles), and within a minute you get automated solvers that far outstrip manual solves even at their glacial advancement pace. Speed upgrades quickly softcap due to cost increases so solving puzzles never feels fast, and everything resets when you enter a challenge anyhow (rewards are just a small income multiplier). The challenges range from interesting to frustrating, but the automated solvers power through them with little effort on your part and the game runs out of content quickly. It's a cool idea but would benefit from more work and polish.