3D Interlocking Puzzle Cube

Using Tinkercad, create a 3x3x3 interlocking puzzle cube containing 27 cubes (each 20cm3). The puzzle cube has 5 unique interlocking pieces each a different shape and color. Each interlocking piece is made up of 4 to 6 cubes. Only one flat piece is allowed, the remaining four pieces must extend in the X, Y and Z direction. Cube can be created without any flat piece, like mine.