Psyonix is introducing a limited-time Knockout Bash mode that  looks like a battle royale’s last-one-standing. Eight players try to survive by attacking each other and staying inside an ever-shrinking Safezone. Knockout Bash will be available to play from April 27 to May 10 with three maps  Calavera, Carbon, and Quadron devoted solely to this free-for-all combat

GAME RULES

Team Size – In Knockout there are no teams. Instead, 8 players compete in free-for-all action.

Lives – Unlike Soccar, Knockout doesn’t have unlimited respawns. Players will have to watch their back because once you’ve been KO’d 3 times it’s game over.

Safezone – Surrounding the arena is a translucent dome called the Safezone. When a player is knocked out of the Safezone, they must return within 10 seconds or they will be KO’d. Throughout the game the Safezone will shrink, increasing the danger. After 6 minutes the match will enter Sudden KO, where every Attack or Throw is maximum power, and being knocked out of the Safezone causes an instant KO.

Hazards – Each Knockout Arena contains several Hazards, including Spikes and a Laser Grid that lies below the platforms. Touching a Hazard will result in an instant KO.

Checkout the official announcement at https://www.rocketleague.com/news/smash-into-spring-with-knockout-bash/