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by entering your model number.. Got what it takes for a brainy competition? Face off in the game of Otrio, a head-to-head strategy board game!. Players compete to line up three pieces of the same color my similar size; in ascending or descending order; or within the same space.. Playing Otrio encourages players to cultivate their reasoning, strategizing and critical thinking skills.. Otrio is made for 2-4 players aged 6+.. Includes: 3 Red Pieces of Large, Medium and Small (in heat seal bag), 3 Green Pieces of Large, Medium and Small (in heat seal bag), 3 Blue Pieces of Large, Medium and Small (in heat seal bag), 3 Purple Pieces of Large, Medium and Small (in heat seal bag), 1 Wooden Play Board, 1 Instruction Sheet