0040 is one.
It is when someone gets a challenge code, they tell you it, then you type it in and you play against them.
I'm pretty sure there isn't any. The closest you can get is the special moves for each character.
titanic caller tune
the code is 5433
Morse code
sos
the code is 626711
TOMAS
Morse code
the man who made Titanic , they challenge Allah
The code is MHRAC