Dotemu Working to Resolve Streets of Rage 4 – Mr. X Nightmare DLC Nintendo Switch Purchase Issue - Niche Gamer

Dotemu are working to resolve issues preventing Nintendo Switch players from buying the Streets of Rage 4 – Mr. X Nightmare DLC. 

News – Darkstalker90 Gaming

Streets of Rage 4 - Mr. X Nightmare DLC shows up on SteamDB

Best Streets Of Rage 4 Posts - Reddit

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Streets of Rage 4 'Mr. X Nightmare' appears on SteamDB teasing

News - July, 2021

Dotemu is working to fix Switch Streets of Rage 4 DLC purchase problem

Streets of Rage 4 - Mr. X Nightmare (NS)

News - June, 2021

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Mr X Nightmare DLC for Streets of Rage 4 now available on Switch

Streets Of Rage 4 - Mr. X Nightmare

News - August, 2019

Streets Of Rage 4 - Mr. X Nightmare on Steam