Tetris on the PSP is an interesting story itself, first of all, did you know Tetris did get an official release on the PSP but not a physical copy only a digital release. But still, I can not explain why there is a PSP ISO and why there is no official announcement of a PSP release. To my amazement, the game is still available through the PSN but not in the US, only Asia, and Europe. Why that is, I do not know why, but I did find a Tetris Homebrew it's an okay version. But I found the controls are very sluggish other than that it is playable.
But I have to give it 3 out of 10.