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Sixty-Four, or 64, is a Numberblock made up of 64 blocks. She is an 8 by 8 square, and a 4 by 4 by 4 cube.

Sixty-Four first appeared in The Big One as a compound Numberblock, then in More to Explore, Eight draws Sixty-Four on the grid in the square temple.

She also has on the back of her a chess/checkers board.


Sixty-Four has 60 violet blocks and 4 lime blocks with purple borders. On the back of her blocks, she has a black and white chessboard as revealed in Square on the Moon Her eyes, mouth and eyebrows are blueish purple and her limbs are purple. She also has a black numberling on top of her(64).

Episode Appearances

  • Total: 4 + 1 drawing (figured-out) 1 (compound)



Has its own page.


  • Sixty-Four is the first Numberblock in the 60s to be figured out.
  • Even though she's a super-rectangle, she doesn't have an array display.
    • This is probably an error while making her rig.
  • The actual Sixty-Four has eyebrows, unlike her drawing in More to Explore.
  • Sixty-Four is the only figured-out Numberblock to have 7 factors.
  • She likes technology because of binary being used a lot in it.