Which is also similar to Elm's time travel debugger: http://debug.elm-lang.org/ http://debug.elm-lang.org/ Direct link to Elm's demo similar to Bret's: http://

Which is also similar to Elm's time travel debugger: http://debug.elm-lang.org/ http://debug.elm-lang.org/ Direct link to Elm's demo similar to Bret's: http://debug.elm-lang.org/edit/Mario.elm http://debug.elm-lang.org/edit/Mario.elm (video: https://www.youtube.com/watch?v=RUeLd7T7Xi4 https://www.youtube.com/watch?v=RUeLd7T7Xi4)