This is a pretty challenging little puzzle that is relatively easy to make. You will need to color the blocks per the drawings. The strap was taken from a back pack.
There are three puzzles to be solved.
Puzzle 1: - Arrange the cubes inside the enclosure so there are 4 different colors in each side.
Puzzle 2: - Pull the cubes out the enclosure and form a 2x2 square out of the cubes. For this puzzle, you must have 4 different colors on the top and bottom, and 2 different colors in each side.
Puzzle 3: - Again, this one is outside of the enclosure and makes a 2x2 grid. For this puzzle, you must have 4 different colors on the top and bottom, and same color on each side.
Per Wikipedia, the puzzle was created by Frank Armbruster and published by Parker Brothers in 1967.
Note that you will also find this puzzle under the names, Four Cube Puzzle and Stop or Traffic Light Puzzle.
The full solution video for all three puzzles is shown in the following two videos:
More Info: https://www.instructables.com/id/Instant-Insanity-Puzzle/
Plastic Version on Amazon: http://amzn.to/2A8x2Yk