Brute Force

If your game has been saved, all you need to do is select "Campaign" (first choice at the first game menu) and then either choose the 3rd option "Resume Last" (which will quickly load your last game) or the 1st option, also called "Campaign", where you'll see a list of all profiles created.

In this mode, select the profile you used ("Default", "Inverted" or something else you, yourself, created) and you'll see a list of every game saved under that profile. Select the one you want, and that's it.