Rumble Blast is a single-player game. While you can compete against other players on the leaderboards, there is no way to directly play against them in real-time.
If you are looking for a similar game with online multiplayer, you might want to consider:
* Brawlhalla: A free-to-play platform fighter with online multiplayer and cross-platform play.
* Super Smash Bros. Ultimate: A popular fighting game with extensive online multiplayer options.
* MultiVersus: A free-to-play platform fighter featuring characters from Warner Bros. properties.
Let me know if you have any other questions about Rumble Blast or other games. 😊