This one of a kind cube consists of 8 smaller cubes. Each smaller piece has three triangles attached and set in different configurations.
Dismantle the large cube into the 8 smaller cubes with extra triangles.
Then put it back together by finding the right way to fit the smaller cubes so no triangle shows on the outside (see image).
Warning: Aligning the triangles takes more than trial and error.
Good Luck from the team at Wolfpack Games!