I immediately began google searching "big jenga" and quickly found options from Amazon & Etsy. They weren't cheap either. We both thought it looked easy enough to make. So we did.
To make your very own backyard Jenga you will need:
Hand or circular saw
4 - 2" x 4" x 16' boards ---> (this makes 72 pieces which makes it more fun!)
Cut all boards into 10 1/2" pieces.
Sand to smooth out the splinters. I used a palm sander.
You can find Jenga rules here. Let me know if you try it. Have fun!