How to make a second floor on a box fort?

Question

I am going to soon make a box fort ( 2 days ) and i need 2 floors on it. It is pretty big so it will have to cost a maximum of $50 and be available in canada.

If you guys have any ideas i also appreciate that too!!

Thanks to all that answered

Answer 1

Well, I'm not sure the 2nd floor of the box fort will be stable enough for people to be on if you were planning on playing in it. I'd suggest getting something more stable. IF  you really wanted to though, you would have to make supports...and find some really stuff cardboard.