Earlier quoted context omitted.
But why would his puzzle game collection waste someone else's time ? He's the one collecting the games or doing the puzzles so why would it waste anybody else's time but his ?
Because his puzzle-games collection are computer games you can play yourself, they can be found here: https://www.chiark.greenend.org.uk/~sgtatham/puzzles/ Or in the appstore/playstore. My current timewaster is 'patterns',a nonogram puzzle
I assume that the interest in games and the hostname of his webserver are very much related.