remove comment line and add difficulty (1-10)
remove comment line and add difficulty (1-10)

freeCodeCamp/arcade-mode,freeCodeCamp/arcade-mode,kevinnorris/arcade-mode,kevinnorris/arcade-mode,kevinnorris/arcade-mode,freeCodeCamp/arcade-mode,kevinnorris/arcade-mode,freeCodeCamp/arcade-mode