Suprisingly good, Highly inovative. PSP needs this game.
(edited part: After about 10-20 hours of gameplay, I solved the first 7 stages and most of the 8th stage. After that, I was in hell of the mind numbling frustration. This game is fun for most of the time, but the later stages are just pure brain killer. It's so difficult that I felt nausea and want to vomit. And more I am stucked at these difficult stages, the more I felt like wasting time on some impossible labyrinth. I still kept this game for time sake, hoping I could solve these remaining puzzle someday. so good luck!)
Simple is not always bad! The concept of the game play just lets your avatar which is a white silhouette move around on a grid based 3-D space, moving boxes around, avoiding laser beams and security's flashlight, putting weight on weight operated doors or going through a maze from memorized sequences, etc. The ultimate goal is to reach the lighted exit at another end of the room. Sounds simple but every single puzzle is a great mesh between reflexes, decision making, sharp vision and a comprehension of 3-D space. There are 100 puzzle total in the game, and the difficulty ramps up nicely. Despite the titular "PQ" testing function of this game, which doesn't make much sense especially with the global score ranking system, you still get a clever, well design with high replay value puzzler. Whenever you solve a question, you can feel a sense of achievement and thus gain more interest in playing more of the stages.
Graphic wise, the art style is very unique and aesthetically pleasing. It gives a mood of psycho space kind of feeling. The tecno music grows tired after a few questions within one stage, but at least music changes with every new stage.
One thing you should consider is that this game features a camera angle that's fixed and only can be swung back and forth quickly by pressing the shoulder buttons. This proves frustration in some questions where you really wish to gain more of a look at the entire room. Besides, when you have the camera angle shifted, the character's movement is difficult to control.