أفضل ما بالشوكولاتة سوادها.
Correct, but the better expression is
كلما كانت الشوكولا أغمق، كلما كانت أفضل.
الشوكولا الغامقة -أو السوداء- هي الأفضل ^_ ^

yeah indeed we're enthusiastic with this great game

the other is 100% correct
"I will cope with difficulties and then I'll become the victorious"
you can also say

I will cope with difficulties and be the victorious