Press keys 1, 2, 3, and 4 to change the variables at the top. Then press the save button and copy the loadCode variable onto your clipboard. Now you can refresh the page and hit the load button, and paste in the already copied loadCode variable. Hit enter and you can now see that the variables at the top changed back to where they were before. You can use this system to save all sorts of data for games and such, but it will not work for words.
Credit to @Dk_minigame for the tutorial on this.