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Building on the long common history of board games and intelligence research, we have developed a new deductive reasoning test based on the popular game Mastermind. Research questions of this registered report are: (a) Is a psychometrically sound measurement of the ability to solve Mastermind items possible (i.e., a reliable, one-dimensional measurement with a good coverage of difficulties)? (b) Is the ability to solve Mastermind items substantially related to other measures of cognitive ability (i.e., convergent and divergent validity)? (c) Can item difficulty be predicted by the number of colors, positions, premises and a newly proposed entropy-based index?