[Bkeeneykid]

I think the easiest way to explain these games is the way FIRST usually does it: Explain the story. In various media, frank talked about how they tried to form a goal of the game with some sort of story. So instead of saying "we crossed some defenses and shot boulders" explain it like "We were storming a castle and had to cross their borders and damage their castle". These games are designed around this, so use that to your advantage. Here's how I've been explaining STEAMWORKS:

Two alliances are preparing for a airship race, and must prepare their airship to be the fastest and longest lasting. They can power up more rotors to be faster through delivering gears, as well as shoot fuel to power their airship more. At the end, all the robots climb onto the airship to take off for the race.