Frisk found the two skeletons up ahead with the two dogs that agreed to help out. As soon as Papyrus saw them announced that this next puzzle was truly a devious deceiver of a...Papyrus paused, he couldn't think of the right word...
Sans chimed in by asking his brother if his alleged alliteration awesomeness had unexpectedly unravelled at the sight of such an unparalleled and unprecedented display of puzzling perfection.
A cricket chirped in the silence that followed.
Papyrus picked up his train of thought and gestured to the puzzle before him. The two dogs stood on a square slab of stone that was just one of many on the grid they were on and the only difference was that the slabs were gray instead of brown. Papyrus explained that the goal of the puzzle was to move the dogs from the brown rocks they stood on to the rocks in the middle of the grid. Frisk nodded as they were told that when one dog moved, the other would copy them and that the dogs could only be moved one space at a time.
Frisk took a moment to plan ahead, failing this should be easy right?
They came up with as many wrong paths as they could and each time they got 'stuck', the two dogs moved back to their starting positions. After fifteen minutes Frisk admitted 'defeat' and was about to give up when the dogs moved on their own and loudly commented that the human had solved the puzzle.
Papyrus took the news in stride and congratulated Frisk, they must like puzzles almost as much as he did. The enthusiastic skeleton vowed that he would not let the human best him! He told Frisk they had better be prepared because the next puzzle was one designed by Sans!
After Papyrus left the two dogs let Frisk pet them for a bit before leaving. Sans shrugged and said that Frisk was doing a good job and there was no need to worry about Papyrus, he's pretty harmless.
Sans promised to keep an eye socket out for them and walked off in the complete opposite direction of his brother.