Harry Potter: The Goblet of Fire Cheats :
Secret - Never use a chocolate frog when you have two-three players
When you are playing two or three player mode and one of you dies all you have to do is pause as soon as you hit zero, drop out, and the computer will revive itself. Then simply drop back in and you will have all your hp and not use up a frog. Please note this only works if 1) you dont all die at the same time (very unlikely in 3 player) and 2) one player alone doesnt work.