As soon as i saw Icysnowman's run, i knew this can be optimised to 5:30, or 5:00. Although getting a time close to 5:00 turned out to be really hard, i still believe that this time could be achieved, maybe even by me.

Overrall this world is really fun, especially 4-13. All other levels have good strats, except maybe 4-11 and 4-14.

Ill probably continue running individual worlds after getting another sub 18 in 4 worlds. Not sure if ill be doing challenge or Serenity Valley and Steamtown afterwards, we'll see.