Sudoku Four in One

数独四合一 is a logic puzzle game for the NES/Famicom console. Gameplay involves solving multiple Sudoku variants on a single cartridge, with standard 9x9 grid rules where players fill empty cells with digits 1-9 so each row, column, and 3x3 subgrid contains all unique numbers. It features different difficulty levels and multiple puzzle variations within one game. The game modes include single-player puzzle solving and time trials. There are no named characters as it is a pure logic title. What makes it stand out is its combination of four Sudoku puzzles into one cartridge, providing hours of brain-training entertainment for retro enthusiasts.