Homebrew developer seanPaul223 has updated Luigi's World to version 2. The latest build implements a few changes including new graphics and more options.

According to the documentation, the homebrew game now has some new graphics, a theme selector, as well as implements a some code optimisation. The gameplay is essentially the same though with Luigi collecting diamonds as he traverses through the level.

If you plan on installing Luigi's World v2 on your PlayStation Portable, be sure to go over the documentation included in the zipped file to avoid any problems.