What we qualify as a single player run, is if you are using only one controller to complete the game. So, since the ps3 allows you to change your controller num ber ingame, you can change your controller num ber and spawn another sackboy, while the previous sackboy stays in the game for a short time. While the other sackboy is still alive, you can change back and forth between the sackboys to control them invidually. With this you can perform all of the multiplayer sections in the game while still using one controller.

Here is a playlist of all the x2, x3, and x4 sections in the game done with only one controller https://www.youtube.com/playlist?list=PLSx6AAsHna_ShFV4pkyCc_C034ply7PCB

Yeah guys let's just make 100% require only some of the items in the game Kappa b