This game is fairly simple in itself. The goal: make the previous poster regret ever wishing for what they wished for.
Corrupt a Wish goes like this: the first person makes a wish. The next person grants that wish but twists it up before wishing for something themselves.
Here's an example
Person 1: I wish for a cake.
Person 2: Granted, but the frosting is made of cement.
I wish for an apple.
Person 3: Granted, but it's full of maggots and worms.
I wish for (etc.)
I'll start off.
I wish for 99 mining