"To begin the game" means to start a particular activity or competition, such as a sport, a board game, or any other form of playful or competitive interaction. Full definition
Each player begins the game by placing two blocks on any two mushroom spaces they choose. (edutopia.org)
When a player starts from bench he's in reserve, granted some of them come on most games but they still began the game in reserve. (justarsenal.com)
Each player begins the game with different resources (strength, victory points, movement capabilities, and popularity), their choice of several faction - specific abilities, and a hidden goal. (stonemaiergames.com)