The 2022 Rocket League free-for-all mode in which each player has three lives is Knockout.
Knockout removes the usual goal-based structure and team play. Players compete individually in special arenas with hazards, trying to eliminate opponents by using three core actions: Attack, Block, and Grab. These actions interact in a rock-paper-scissors-style relationship, so timing and reading an opponent matter as much as direct control.
Each competitor begins with three lives. A player loses a life after being knocked into a hazard or otherwise eliminated, and the last player with a life remaining wins. If the match continues for six minutes without a final survivor, it enters Sudden KO mode, where attacks become more powerful and leaving the safe zone costs a life.
Knockout is easy to confuse with Rumble because both emphasize unusual mechanics, but Rumble remains a team mode with temporary power-ups. Gridiron also differs: it is a football-inspired limited-time mode built around teams and scoring rather than individual survival.