In the thesis, we study games on graphs that are based on domination. Our main focus will be the domination game that is played by two players, Dominator and Staller, who are alternating in choosing vertices of a finite graph. The game ends when the set of chosen vertices forms a domination set. Dominator's goal is to finish the game in as few moves as possible, while Staller wants to delay the end of the game as long as she can. The total number of moves in the game, when both players are playing optimally, is called the game domination number. In the first chapter, we present the historical background of the domination theory in graphs, and introduce the domination game along with its first results. In Chapter 2, we study the domination game on disjoint unions of graphs, while Chapter 3 is used to present exact formulas for the game domination number of some simple classes of graphs. In the fourth chapter, we find highly connected families that realize all possible pairs of game domination numbers. In Chapter 5, we construct infinite families of 3/5-graphs and 3/5-trees, while Chapter 6 is used to solve a classical problem of graph invariants regarding edge and vertex removal. In the last chapter, we first present an overview of the similar combinatorial games, and then steer our attention towards the combinatorial game dom that has similar rules as the domination game. We compute Sprague-Grundy values for some simple families of graphs.
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