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The basic setup of the game involves a square field divided into cells, each cell containing a number or symbol. The player uses logic to determine where certain numbers or symbols should be located based on the rules that have been set.
A common rule in Shinro is that each row or column must contain unique numbers or symbols. Also, additional rules may be present, such as restrictions relating to sums or products of numbers in certain field areas.
The player uses logical thinking and deduction to fill the field in a way that meets all the rules of the game. The game usually becomes more complex as the player moves through the different levels, and new rules may be added that require additional thought and strategy.