This is a member of the Evil Twin-family, but in 5x5x5 cube shape called Devil Twin . Like all of these puzzles, there are at least two basic puzzle fused into one, and additional cubies were glued on to create a new and bigger puzzle. In this case one 4x4x4 and one 3x3x3 were fused like the Fused Cube and the additional cubies create the illusion of the 5x5x5 cube. The puzzle does not turn like a regular 5x5 cube, but creates unique shapes as the cores of each fused puzzle turns.
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