[There's a bit of a snicker at the reply, an understanding. Yeah, with nothing else to do, it would be easy to just plow through as many puzzles as possible. Eri sort of looks between them, not quite getting the joke.]

I've got a lot of other things I could be doing. [which was part of why he could do them so leisurely, after all]

... I could probably do them on my tablet, if I wanted, I'm just old fashioned. [If he did them on his tablet, then Shigaraki wouldn't have the share the books at all. It's a weird situation, in which Shigaraki is trying to share and Aizawa is trying to give him something.]

[He leans forward a bit where he's sitting, resting the book of puzzles on his lap. He twirls the Hello Kitty pencil in his fingers.] I like pencil and paper when it comes to relaxing.

[His tablet was for work and cat videos. Cat videos were also relaxing but, well. He needed the digital apparatus for cat videos. It was essential.]