It is strictly less powerful than a REPL.  Claiming that you can&#x27;t live code a game at a REPL is false, because I do it on a regular basis.  When I write games in Scheme, I use a REPL to write the game live, doing all of my editing within Emacs.  I do not have to save files for the code to be evaluated, I just press a keystroke to evaluate the specific form I&#x27;m interested in.  I can evaluate more fine-grained sections of code, not only entire files.