Sonic Rumble is currently only available in a certain number of countries.

We are planning to expand the distribution and supported languages, so stay tuned for future releases!  Once updates are available, they will be shared on our official channels:
Website: https://sonicrumble.sega.com/en/
Facebook: https://www.facebook.com/SonicRumbleOfficial
X (formerly Twitter): https://x.com/sonic_rumble
Discord: https://discord.com/invite/SonicRumble
Reddit: https://www.reddit.com/r/SonicRumble/