Ultimate Minecraft fort! I made this with 28 cardboard boxes for my son's 9th birthday party. Inside are tunnels and a "cave" in the center big enough for a 5'10" mom to stand up in. I then wrapped the bottom row with scene setter plastic covering from the party store. The kids LOVED it!
Inside the Ultimate Minecraft fort. You can see the three tunnels in this picture (along with a small fan I added for ventilation). On the right is a zombie and on the far end is a creeper I taped up inside. The kids had to find characters from the game in the dark with nothing but a glowstick in their hand. They had a laminated card and a crayon and checked off each creepy character as they came across it. It was a "cave" scavenger hunt and the kids LOVED it! (9 year old boys)