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Firebase

Firebase used as a backend for Sudoku Ultimato: handling real-time data, user state, and analytics for a cross-platform mobile app.

  1. Sudoku Ultimato, Sudoku & Killer Sudoku Without Intrusive Ads

    Sudoku Ultimato

    Jan 2026

    Sudoku Ultimato started for a simple reason. My dad wanted to play Sudoku without subscriptions, pop-ups, or constant interruptions. At the same time, I was getting tired of ads, locked features, and ...