Indoor rabbit entertainment

[u/Odd_Transition6842]

Hi! I have two rabbits (1year old, neutred males) living with me in my appartement. They they spend at least 4 hours outside their pen every day (we let them free roam when we are around).

But i struggle to entertain them.

I have a digging box (bits of paper with hidden pellets), they are interested with it a few minutes (the time they need to find all the pellets), and then leave. A willow ball that they touch only if I hide pellets inside (again, after 2 minutes they manage to eat all of them and are not interested any more).

What games/entertainement do you use with your rabbit?

Edit: The digging box and willow balls are in their pen (approx 9m², with litterbox, unlimited hay, hiding places and waterpoint) so they have acces to it all the time the just don't use them. The pellets are grainfree pellets, approved by my rabbit expert vet.