The Cheops Puzzles ... Bringing the Egyptian Magic back!
The 5 puzzle faces are mounted in a traditional pyramide (see yellow pyramid above)... but when you only use the 4 triangle faces you can make a four-sides pyramid (red Tetrahedron).
but there is more: combine some pieces!
Combine 8 triangle pieces of the above 3 basic Toy Cheops Puzzles to make this Octahedron!