If it had actual code, it would be more meaningful, like Perl's Obfuscated code challenges which the code is shaped as an image. In the honor of REPL, it should be recursive and Turing complete.
Imagen, the λ made in lisp code which displays itself. It shouldn't be that hard. For level 2, itself endlessly displays itself (ncurses based?) and evaluates itself. Level 3, embed a compiler, so that it spawns itself, and learns how to code itself (λ virus).