Also, though you wouldn't know this on your first playthrough, the machine which Papyrus uses to set up the puzzle is Mettaton, making it likely that the "randomly generated" puzzle's failure was just a prank played by Mettaton on Papyrus. Thankfully, you're not expected to succeed in finishing it within the given time limit, although it's still possible. underwhelming "randomly-generated" puzzle which always ends in the same outcome. Around two and a half areas later, all the way in Hotland, the puzzle returns, and you're asked to remember them all, and the only practice you could have gotten was on an. complicated enough that even Papyrus can't keep track of them due to her poor handwriting, and if you say that you didn't understand the rules, he tries repeating them, but gets them mixed up and gives up on the puzzle entirely. Alphys, has a ludicrously complicated set of rules. One of Papyrus's puzzles, designed by Dr.wait, isn't that just called sleeping?" (This phone call also reveals that Papyrus himself rarely sleeps, in spite of having a bed himself). sleeping." Later on, a certain phone call with Papyrus and Undyne involves Papyrus saying "LATELY 'S BEEN NAPPING OVER 7 HOURS A NIGHT.", which the latter then responds with, ".
At one point within Sans and Papyrus's puzzle hijinks, Papyrus tells Sans he's frustrated about Sans napping all night, at which, Sans corrects him by saying, "i think that's called.