Georgi Gachev
Institute of Mathematics and Informatics,
Bulgarian Academy of Sciences
https://doi.org/10.53656/math2024-3-5-int
Abstract. The article presents the mathematical game ‘Combination Nine’. The game requires the numbers 1 to 9 to be arranged in the nine corner points of a 2 × 2 square grid in a way that the sum of the numbers in the four corners of each grid cell is equal to the number set inside the cell. Both the classic tabletop version of the game and its Internet-based electronic prototype are described in detail. The quantities of game combinations of various types are analysed. Guidelines for successful resolution are provided. Typical scenarios for using the game for educational or entertainment purposes are indicated.
Keywords: math game; combination; computer game
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