Easy game. All you have to do is correct the person above you's correction.
Example:
Player 1 (me): hi guys.
Player 2: Um, thats, "Hi guys." With a capital "h".
Player 3: Ha, your a fail! It's That's not "thats".
Try to annoy each other as much as possible and make it as hard as you can! I'll do the starting sentence.
Hey, i really hope you guys like this game. It's to test how you good your grammar is.