Blizzard adds the co-op mutation info into the Map Editor Data usually weeks before the mutation goes live. Here is how to access this info:
- Create New [click the green paper on the leftmost part, or press Ctrl+N]
- Select the Extension Mod radio button, then press Next.
- Select the Custom radio button, then click Modify.
- Click Add Other.
- Double-click alliedcommanders.sc2mod, then click OK. Then click OK again. Then click OK again. Then wait for the new file to load.
- Click the blue marine on the top bar to go to Data, or press F7.
- Go to the user types folder, then find and click “Mutator Challenges” in the list below.
- The list of new mutations will then appear.
- I like using the Detail view [Ctrl 2] to see the mutation missions lined up in a neat table. Enjoy!