There are so many words involving cool things in that title. I can’t make it any shorter though, because this is exactly how many layers of awesomeness are involved with this cool build.
Made by Baron Von Brunk, this is a lego transformer that alternates between beeing a badass robot and being a sega handheld. Oh, and it is sonic themed. There are more detail pictures as well as character names and stuff on Baron’s page.