Cubix, 100100

@'dOu

Cubix is a 2-dimensional, stack-based esolang. Cubix is different from other 2D langs in that the source code is wrapped around the outside of a cube.

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Explanation

The first thing the interpreter does is figure out the smallest cube that the code will fit onto. In this case, the edge-length is 1. Then the code is padded with no-ops . until all six sides are filled. Whitespace is removed before processing, so this code is identical to the above:

  @
' d O u
  .

Now the code is run. The IP (instruction pointer) starts out on the far left face, pointing east.

The first char the IP encounters is ', which pushes the next byte onto the stack; this byte is d, or 100. Next is O, which outputs the top item (100) as an integer.

Then the IP hits u, which turns it to the right, moves it forward, then turns it again. It switches to the bottom face pointing north, then rotates to the east. This wraps it to the O again, outputting 100, then up to @ which terminates the program.