What is the Giant's game

The Giant's game is another of the games bordering on reality. While it is just a game, Ender remains engrossed in and almost obsessed with it and the need to beat it. It is not clear that the game ever ends, however; the computer can always add new scenarios. The Giant's Drink, at least in Ender's case, is designed so that he only can win by breaking the rules--he has to refuse to drink the Giant's Drink but instead attack his eye. The first time Ender broke the rules in such a "game" was against Stilson, when he chose not to follow the "rules of combat" and kicked Stilson when he was down.