Very sneaky Duolingo! Introduce "sulit" and then ask about "susah"!
That moment when you mess up this sentence...
Tak is short foe tidak. Whoever design this is obviously ignorant
What's the difference between sulit and susah?
I don't think there are differences, cuz both sulit and susah are informal,
The formal word for sulit and susah is "sukar" but we doesn't use that these days.