basically get a autoclicker and set it to click every 1 millisecond and you will eventually see a a book saying "welcome to the second floor" and it will bring you there
or alternatively after getting book 1 and 2 start using the autoclicker once you get to book 3
this game is so great and educational that I started bashing my head into the drywall and munched on the insulation and cables while I peel my nails off :D