I find the playpen immensely helpful for bonding time with my new hedgehog. When I have it set up in front of his cage (2nd photo) I can sit there while tending to his cage each morning. Then I take him out and he can explore while still being close to (and getting accustomed to) me. He is also able to climb back in his cage when he wants.
With the pen not closed on itself in a circle, but spread out as it is in front of his cage, it creates a floor space twice the size it would otherwise.
here with my Mecki-- born 2/12/19