I finished the cube but got this on 1 side:

enter image description here

How do I fix it without ruining it?

It is fixable, I did it once but I don't know how I did it.

  • $\begingroup$ This isn't really a puzzle. However, most Rubik's cubes allow you to take out the middle piece and put it back in so you can tighten/loosen the cube. $\endgroup$ – boboquack Apr 2 '17 at 9:31
  • $\begingroup$ Check out this page for rotating center pieces. alchemistmatt.com/cube/rubikcenter.html $\endgroup$ – Ian MacDonald Apr 2 '17 at 11:29
  • $\begingroup$ What I usually do is hold the cube with the center that has to be rotated 180 degrees at the top, and then use: R U R' U (5x). Jaap's algorithm seems to be shorter though, and actually has reasoning why it works. $\endgroup$ – Kevin Cruijssen Apr 2 '17 at 18:17

Hold the cube so that the centre to be twisted is in the U face. Then do the 12-move sequence:
R L U2 R' L' U
R L U2 R' L' U
What the first 5 moves do is to swap two opposite corners and two opposite edge of the U face. After a U quarter turn the moves are repeated to swap the other corner pair and edge pair. This means all the U layer pieces have been rotated 180 degrees around relative to the centre. When the U layer is then turned to its correct location it is only the centre that has twisted 180 degrees.

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