3D Wooden Puzzle Tower

Last week I was looking through some of the vendor catalogues for some new materials for my class. I found an interesting puzzle tower but it was more than $50. I decided I could make a similar toy for much cheaper. After a Home Depot run I spent a couple hours building it in my dad's workshop. I left the wood unfinished as it fits more with our school's natural materials philosophy. I bought enough wood to make two, so the grand total for one of the puzzles was only about $10.