Surprise! Beating Kranion's Secret Weapon unlocks the 2006 Super Freaks in all of their poorly drawn glory. You also get Secret Run, which is all of the secret levels minus Exciting Encore, all of which are altered layouts from the 2006 and 2016 versions of the game. With these two things combined, you can technically play an abridged and heavily upgraded original Super Freaks 1.
At this time, SuperFreaksDev has 3,956 views for Super Mario Maker 2 spread across 67 videos. The game makes up 6 hours of published video on his channel, roughly 9.52% of Super Mario Maker 2 content that SuperFreaksDev has uploaded to YouTube.
2