FFA (free-for-all) is the standard game mode. Every player is on their own, and every other robot is an enemy. Players score a point for each robot they disassemble, and the leaderboard ranks everyone by score.
Mazes have short sight lines and lots of corners, so fights tend to be decided quickly. This makes weapon choice about as important as aim. The Beam is strongest for whoever spots the other player first down a long corridor, while the Prism is best when a fight starts at close range around a corner.
The four crowns also play a big part. A player wearing Speed or Health is much harder to beat than the same player without it. Going to collect a crown takes time away from scoring, and dying while wearing one means losing it.