Since the digital storefront is dead, your most reliable option is buying a used physical Wii U disc from:
Disclaimer: This article does not host or link to ROMs or illegal downloads. Always respect copyright laws and support official releases where available. Download Sonic Boom- Rise of Lyric
Before you search for a download link, you must understand one hard truth: It is a Wii U exclusive . Since the digital storefront is dead, your most