My roommate interrupted me during 3-4, and I had a couple silly late-stage deaths. AND starting about world 11 my left hand started cramping up really badly because I had been subconsciously gripping my controller too intensely. Lastly, sometimes the Xbox version of this game will simply not respond to precise readjustments, which will frequently lead to misses especially if you are going fast. Despite all of that, somehow this was still a PB for me -- both in time and in points -- despite having completed a couple deathless runs in the past. I'm not very satisfied that I died so many times in world 12, but I don't see myself doing this again anytime soon.