My boys have just had a mad half hour. They were in the conservatory for a run whilst I cleaned out their cage. I put both their tunnels and Current bun's in a line to make one long tunnel with a kitchen roll nearby for them to chew. Just put my head round the door to check on them and they were going mad. Both boys were taking turns to sprint through the tunnels and then leap the kitchen roll tube. They did this for ages. Very entertaining, especially when they both started at once from opposite ends and bumped into each other in the middle tunnel
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Poor current bun was sitting, terrified, on a toybox watching.