A lot of people have had trouble getting the hombrew game called SQUAREZ to work on the slim and 3.xx/4.xx kernel. For some reason even if you merged the KXploited version into one eboot it still wouldn't work.

Well I looked into it and did a little hex editing to make it work. I discovered that there was just something wrong with the PARAM.SFO file.

All credit goes to the original creators, I just wanted to play it on my PSP and didn't do much to make it compatible.