[telmah]

Platformer games are games where the player has to jump from one platform to another in order to advance, and pick up items on the way. Games like Super Mario 64, Rayman, or Sonic belong to this genre. Psychonauts can be considered a platformer because it has similar mechanics to other 3D platformers.

But Psychonauts has also been called an action-adventure game, because it has action (combat, jumping around) and a story. Genre definitions are always tricky, because they're quite fuzzy, and there are many labels that can be slapped on the same game. There are people who have asked me if I talk about any Final Fantasy games, because they think that's what adventure games are.

In any case, yes, Psychonauts is a platformer, as well as an action-adventure game.