leikkiä

Verb

 * 1) to play act in a manner such that one has fun
 * 2) to play with, treat like a toy
 * 3) to play to give an appearance of being, contrary to fact
 * 4) to pretend assume something is true for the sake of argument
 * 1) to pretend assume something is true for the sake of argument
 * 1) to pretend assume something is true for the sake of argument
 * 1) to pretend assume something is true for the sake of argument

Usage notes
is used for "children's play", or "playing around", ie. play that generally has no rules or set objectives, whereas the verb for playing organized and rule-bound games is. Likewise, the noun denotes "children's games" and  organized games with rules.