Great for your intellegence.
PQ is not your typical puzlle game like Tetris. It is very inutitive. You get the feel of what it's like to be challenged. You don't feel like you passing with flying stars. It's not easy, but that's what I like in a game.
The game features a person, who has no features. He's just a white figure, and he is the main character, although there are o other characters. He will move boxes out of the way, he will jump over stuff, place boxes in a certain place, etc. He very cool, too.
The challenging part is this. While your moving boxes and jumping around, you have a certain time limit. Now I'm not gonna spoil the puzzles, but there's a hard one that concerns mathematics that took me 12 tries to beat.
Don't tell me I didn't warn you.
Anyway, this game is very inutitive and well-built, and everytime you say "This is Impossible!!", your sense of logic, skill, and knowledge kicks in, and you go into overdrive, trying harder than the last try. That's what's good about this game. It makes you think. Alot.