Board Thread:Game Discussion/@comment-13836039-20140717101148/@comment-24829928-20140718213609

Breaking it down:

A Mission icon (Autobot/Decepticon) has 3 sub-missions each. Each one of those sub-missions has 5 areas. Each of the 5 areas has to be cleared to 100% to progress to the next area. Once all 5 areas are cleared, the boss is open. Same format used in Campaign events, basically.

When you beat the boss, your energon level is increased (also replenished, as if you leveled). If you recall, a fresh account starts with max energon of 100. It capped out at 136 with the original missions. The two new missions, once fully cleared, will raise it to the new 154 cap.

There is also a theory of some hidden bonus if you attain every card in the missions. Each mission has the three character cards to find, plus either a "combat cache" for a 4th character card, or a "boss interrupt" for a weapon card. All found is usually displayed by the small bar below the Autobot/Decepticon icons flashing slightly. What the bonus is, if it really exists, is not known to me. Could easily be a rumor or some feature Mobage never finished. Honestly, I saw no reason not to clear out all the ?, so I did it anyways. /shrug