# How do I fix this Rubik's cube

I finished the cube but got this on 1 side:

How do I fix it without ruining it?

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

• 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. – boboquack Apr 2 '17 at 9:31
• Check out this page for rotating center pieces. alchemistmatt.com/cube/rubikcenter.html – Ian MacDonald Apr 2 '17 at 11:29
• 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. – Kevin Cruijssen Apr 2 '17 at 18:17