This is the not so Super Mario Bros. It's originally a game called Doki Doki Panic and had nothing to do with the Mario series. Since we never got SMB2 from japan, they used this game, change the main characters and called it SMB2. But this is not the same SMB2 that is in japan which is the same game as SMB1 but harder.
MysticGamer currently has 15,636 views spread across 8 videos for Super Mario Bros. 2. There's close to 2 hours worth of content for Super Mario Bros. 2 published on his channel, less than 0.41% of the total video content that MysticGamer has uploaded to YouTube.