Hideous released “Instant Rimshot PSP”.

Release notes:

So, inspired by the awesome site by the name of instantrimshot.com, I thought I wanted something similar, but portable. This was my cue to get into C++ programming with the PSP (previously made games using Allegro and C++ on my PC). So, I am GOING to present to you my first PSP homebrew, which took 2 months to make because of those darned linking orders and such. (actual coding took like 2 or 3 hours).

http://forums.qj.net/showthread.php?t=145833