Nickelodeon Extreme Tennis is a free-to-play mobile game developed by Viacom International Inc. that features iconic characters from Nickelodeon shows as they compete in extreme tennis matches. Players can choose to play classic characters such as SpongeBob, Angelica, Rocko, Garfield, and more. The game has two modes: story mode and multiplayer mode.

In story mode, players can advance through unique challenges and compete in iconic locations such as Bikini Bottom, ZIM's secret base, and the TMNT rooftops. Players can also collect power-ups or throw hazards across the net at their opponents. In multiplayer mode, players can compete against real players and rise to the top of the leaderboards.

Nickelodeon Extreme Tennis allows players to earn outfits and rackets to customize their characters and level them up by earning experience on the court. The game also surprises the opponent with sudden serves and unique special moves.