Jeff looked at the intelligence settings and considered his options.
The most obvious idea was to make himself smarter with a few keystrokes he could have a 4 digit IQ and be the smartest being on history. He could also achieve that by making everyone else dumber.
Speaking of being dumber he could turn himself into a drooling vegetable with ease. Or experience idiocy to by making every one else smarter.
There were options to let him steal intelligence from other people like a brain draining vampire. He could also give away his intelligence in the same way.
There were settings to have people's intelligence change on a trigger. He could give people solar powered brains that became dumb and useless after dark. He could make it so that getting drunk or high made people temporarily smarter. There were tons of options for triggers.
Further down there were options for awareness. He could make everyone into genius but convince them they were retarded. He could make all the smartest people in the into drooling dunces and no one would notice. He could dumb down every one and make them cheer for it.
There were settings so that history would change to match his changes. He could change the past so that famous people in history were complete morons. Or make it so cave people were geniuses. Perhaps just turns all the adults in his life into complete idiots who magically hold down jobs.
There were just so many possibilities.