You love math? You'll like the math constants cube. Despite not being the most beautiful sticker variation, it is fun to solve. All the pieces are unique and the centers are orientable so the cube has only one solved position.
Pictures show opposite corners. You can see Pi, e, Phi, the Euler–Mascheroni constant, the plastic constant and log(2).
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It is fun to solve but once you know every piece it becames too easy and you just stop thinking and solve it using just your memory. ...I think you know where this is going:
Stay tuned for the 4x4x4 and 5x5x5 version!