something like that happened with my super castlevania game. i took it to a friend who had a set of tools to open the cartridges and he found water inside. not much.. just a tiny drop.. not even a full drop. i did not knew how it got there but the game was all flashy and the graphics broke in many parts of the screen. i try cleaning it and using the hand dryer to evaporate any residue but i did not fix it. had to get a new copy.