SudoPop

Sudoku, but it pops. Every right digit pops into candy and pays Digits. Lock rows, columns and boxes for chains, build your combo into Fever, and spend it all on bigger boards and better tools.
Hire Your Numbers
Each digit from 1 to 9 has a builder with a face and a meter. Hire them and level them up, and they drop candies onto the board while you think. Flip the board to play alongside them on a co-op board, or keep the front to yourself.
Boards Made of Boards
Every board size is its own track, and all three run at once. Finish 32 4×4s and they become a Mega 4×4: a 4×4 made of 4×4s. Megas fill Gigas, then Tera and Omega, while the 6×6 and 9×9 tracks climb towers of their own, and every depth a small track opens boosts the bigger ones. Send your builders to the tracks you choose, evolve them to build whole boards at a time, and in the late game millions of Sudokus a second roll past in TURBO, HYPER, ULTRA and OVERDRIVE.
Pop for Stars
When your run is big enough, Pop it. Your Digits turn into Stars, which you spend on the Star Board (itself a Sudoku). Finished lines there unlock perks like Auto-Builder and Head Start.
Real Sudoku All the Way Down
4×4, 6×6 and 9×9 boards from Easy to Hard, always with one solution

A Technique Book: learn Naked Singles, Hidden Singles, X-Wings and more by solving boards that need them

Variant rules: Killer cages, Thermometers, Arrows, Kropki dots, Sandwich, Diagonal and Windoku

Number families: level up Primes, Fibonacci, Squares and more by investing in all their digits

Board events: Lucky Lines, Prime Time, Countdowns and hidden Lo Shu magic squares

Board skins: Galaxy, Molten Forge, Electric, Enamel Coin, Marble and more

Golden Boards, a Sticker Book, and Cubby the blank tile to show you around

It plays itself while you're away, and plays even better when you're there.