MISSION C is now available in the new OEX app version 1.0.2 Click here play stor to update on Google PlayStore
If you are finding it difficult to do Mission X, you can leave Mission X and do Mission C instead.
Switch to CORE Mainet and hold atleast 0.15 CORE balance in your Metamask or OEX app.
Go to Mission C swap 0.00005 CORE to get a minimum of 1 COME. Submit Mission. Done!