These are 4 levels by Nintendo Addict, I love them because of the spikes, and it's nice to stop doing kaizo levels for a while. I had wanted to upload this video for a while, when only 3 of them were uploaded, and had to wait for the last one, but it was worth it! So the main themes of these levels are: Spikes, Yoshi, P-Switches, Tight Platforming and Death. I didn't include deaths in the video cause that would make it incredibly long, but you can see all the other 4 themes. :P
Nintendo Addict also has his own youtube channel, he streams a lot of Mario Maker and retro games, and he has great skills! It's always really fun being in the chat. You should check him out!
Nintendo Addict's youtube channel:
My SMM PROFILE: https://supermariomakerbookmark.nintendo.net/profile/ZPappa7?type=posted
Playlist with MY LEVELS: https://www.youtube.com/playlist?list=PLC_gXk7gL5FEf-OCF1zJRIFm0kOY6FtMB