Sonic Rumble's IP collab Crossover Event 0: Sega Stars is for soft launch players only

Sega’s Sonic Rumble is featuring its first crossover event ahead of global launch, with new pre-release content exclusive to players in soft launch countries.

The party battle royale introduced Crossover Event 0: Sega Stars on April 11th, bringing characters from Super Monkey Ball: Banana Rumble, Fantasy Zone and Altered Beast to the game for a limited time.

The event ends on May 7th, one day before Sonic Rumble’s rescheduled global release date, May 8th.

Pre-launch party

Players who are able to participate in the Sega Stars event will be able to keep the crossover characters they unlock after global launch, although Altered Beast’s Weredragon and Fantasy Zone’s Opa-Opa can only be obtained by purchasing the premium Sega Stars Event Pass.

Altered Beast’s Werewolf can be unlocked on the free tier while Upa-Upa, Werebear, AiAi and MeeMee are available via the in-game Ring Shop and Red Ring Shop.

Sonic Rumble’s first crossover was teased in our interview with Rovio’s Veli Kiviaho, who suggested "we might get a taste of some IP crossovers even before the global launch". He also hinted at the first crossover including an IP "that hasn’t been seen lately in other games".

This was likely in reference to Altered Beast or Fantasy Zone, both 80s titles that predate the Sonic IP. Super Monkey Ball, meanwhile, debuted in 2001 and had its latest release on the Nintendo Switch in 2024.

All three IPs were either developed or published by Sega, but whether all Sonic Rumble crossovers will follow this trend is currently unconfirmed. Three more crossover events have already been teased for after the game’s global launch, but the brands involved are unknown.