Hoppit!
Wise Old Thumper
I don't have bunnies any more but I was just browsing the Hay Experts for gerbil toys when I saw these. It makes me wish I had buns to spoil! Such an awesome idea - you could create all sorts of mazes and things.
https://www.thehayexperts.co.uk/fun-stuff/wooden-houses-by-the-hay-experts.html
https://www.thehayexperts.co.uk/fun-stuff/wooden-houses-by-the-hay-experts.html