We call our 10% time Apenkooien, which roughly translates to monkeying around. If you grew up in The Netherlands, you’ll know that Apenkooien is an elementary and high school game, that’s sort of combines the floor is lava and tag.
For a lot of children it is the best gym class of the year because it gives you the freedom to play however you like, you aren’t bound by rules and still learn while having fun. Apenkooien at TOPdesk is exactly this: developers can choose their topics themselves, they will develop in a direction that suits them and that they like. And because of that, it’s just plain fun!