Mario Tennis Fever brings fast tennis gameplay with arcade energy on Nintendo Switch 2. The game mixes classic tennis mechanics with character abilities from the Mushroom Kingdom. Players use spins, lobs, slices, and defensive moves to control rallies and pressure opponents. The Fever Gauge system adds power shots with visual effects and stronger impact. Adventure mode adds a story where characters face monsters and rebuild their skills. Multiple play modes support solo sessions, local multiplayer, and online matches. The game suits casual play, competitive matches, and party gaming sessions.