After you have completed Mission 6 there is a time challenge. (collect 20 energon cubes in less than one minute) This challenge is extremely simple to do and gives 20,000 energon points per each completion. You get a 3,000 energon bonus for completing the circuit with 15 seconds on the clock at the end, but only once.

Repeat this challenge as many times as you need, to max out your attributes in the medical bay.

The best way is to run back and forth between the 2 gates on the hill that separates them.. As soon as you beat 1 convoey there is another one comeing. I recomend batteling in robot mode and traveling in vehical mode. And if you have the speed boost upgrade I would recomend useing it.