Sudoku, made social. ALI Play Sudoku Arena lets friends race the same grid in real time through Game Center party-code rooms — first to finish wins. Every puzzle is guaranteed solvable by pure logic: the generator and hint engine run on a human technique ladder, so no puzzle ever needs a guess. For purists, Blind Mode removes all feedback — no mistake flags, no undo, no redo. Coins buy avatar cosmetics only; star rank is skill and can't be bought.