To make the Devil's Puzzle block, with it's 16 HST's (Half Square Triangles), start by cutting 2 1/2" strips from your light, medium, and dark fabrics to use with your favorite right angle triangle ruler. Mine is an Omnigrid but there are several other brands.
Stack the the light strip on top of the dark strip with right sides together and trim the left side square.
Make four light/dark sets of triangles and handle them gingerly to keep them together as you sew on the diagonal edge, or the hypotenuse.
Then make four of the same sets using medium/dark strip sets.
Then make eight of the same sets using medium/light strip sets.
Press all 16 open to the darker side.