Mission 28

A survival mission.

The top of the level has a mini-drone factory and four sentinels. They are protected behind two shields. The shield generators are at the bottom of the level.

A platform invites you to go higher in the level, but it is a trap that can easily kill you if you ride it up.

The best way to survive is to make your way into the left chamber, kill everything, and then wipe out the bottom room. If you have time you can go back up and kill the two spawners that were behind one of the shields. It is best to stay in the lowest room to avoid danger until the time is up.