Sudoku Duel - Online

Sudoku Duel turns classic Sudoku into a focused competitive puzzle game. Play 9x9 and 16x16 boards, build a career from beginner to expert, collect Coins through fair rewards, and enter ranked online duels against players on the same difficulty. Ranked matches use server-side matchmaking, Coin entry fees, settlement, ELO ratings, leaderboards, friend challenges, rematches, and account recovery through Firebase authentication. Free offline Sudoku remains available even when platform services are unavailable. Coins are virtual in-game items. They have no cash value, cannot be transferred, and cannot be redeemed for prizes or real-world value.