Unlike standard shop rotations, this isn't a cosmetic you can simply throw rings at. Unlocking Movie Sonic requires actual gameplay progression. Players need to grind through the game's onboarding process and specifically complete the fifth Starter Mission to secure the reward. If you've been putting off your placement matches or basic objectives, now is the time to clear that queue.
For those new to the 32-player chaos of Sonic Rumble Party, the Starter Missions serve as a tutorial and progression track. Reaching the fifth mission is relatively straightforward, but with the deadline looming, missing out means losing access to one of the most distinct character variants currently in the meta. Given how Sega handles crossover and promotional content, there is no guarantee this skin will return to the shop or future events anytime soon.
Make sure to sync your clocks. The April 1st deadline is absolute across PC, iOS, and Android platforms. Once 8:00am UTC passes, the mission reward will likely rotate out for the next seasonal offering. Log in, finish those missions, and lock down your cinematic legacy before the window slams shut.
Soren