This simple wooden lock puzzle will challenge your mind. You are given three wooden blocks. The goal is to assemble them in the cross pattern shown. The last picture shows the solution sequence.
Full Build Instructions/Dimensions: https://www.instructables.com/id/Wooden-Lock-Puzzle/
This is a fun puzzle that is pretty easy to build. The goal is to have all the pins line up in a horizontal manner. The pins are different lengths and the holes in the base are of varying depths. In addition, there is a slant to the base which adds another level of deception.