Abstract
The analyzed research-based knowledge currently offered to Czech teachers is that of J. Piaget.
The sense being to indicate its conceptual and ideological complexity. As the minimum of the offer is the appeal to let the pupils engage in negotiating the rules of their games, reflected is Piaget's theory of the role of games in children's moral development.
Uncovered is Piaget's conception of games as offering only facultative opportunity for overcoming moral realism. Speculated on is the possibility that games offer a form in which children can cultivate their sense of distributive and equity justice by means of enjoying social pleasure in playing with retributive justice (competitions, marbles) and the justice of obedience (bullying, hide-and-seek).