The aim of this paper is to look at Wittgenstein's use of language-games as objects of comparison. I shall use several examples to demonstrate that it is reasonable to understand language-games in the smallest possible units. In particular, I will focus on a language-game of training a rule vertically related to a language-game of applying of this rule. It is important to keep these language-games apart in order to avoid misunderstandings originating from the fact that one and the same sentence may have different meanings in these language-games. Such a sentence may be an admissible "move" in the former language-game whereas it may be an expression of a rule in the latter one.