This is the Super Mario Bros themed hamster playset built by Youtuber yutako55's mom for their pet hamster. That is a chunky lil hamster. If I had a hamster in one hand and a gerbil in the other, would you be able to tell the difference? Because you'd definitely be able to tell I'm having the time of my life.
Keep going for the video.
Thanks to MG, who's hard at work building a Metroid themed playset for his crested gecko.