Nantendo is one of the best themed megacollabs I've seen in a while. This is just over 5 minutes long, each section being either a reference or a flat out recreation of a game, whether it be an indie game, a retro game or more recent ones and even mobile games. Every single part in this level has such a unique style and design, that goes perfectly with the game that it's representing. From Super Mario Bros, to Sonic the Hedgehog, all the way to Five Nights at Freddy's and Undertale. The art is what really makes this level shine, although there are some inconsistencies here and there, with some pieces of art being better than others, but every section is unique in it's own way, while still maintaining a high standard. I'd rate this as an Easy or Medium Demon, simply because of it's length, being an XXL, you do have to remember what comes next and memorize the transitions or you go all the way back to the beginning.
