Consequences is an experimental game based around Corrupt a Wish.
To start, a player makes a wish.
The next player to post grants the wish, changing the game world as the wish is, then becomes GM.
The GM will take actions from players, as many as he or she thinks they can handle and still have fun, then make turns accordingly. The players are in the game world.
After some number of turns the GM chooses, the GM then makes a wish, altering the game world... then somebody else grants the wish, becoming GM.
Players that grant wishes may add some interpretation to the granting of the wish. They can't change the actual wording, but can interpret it or tack other things on.
The game world is consistent. When a new game begins, the same world will be used, though the wish will still modify it... unless...
If the world is destroyed, the world is reset completely.
This game is designed to be sustainable without one constant GM, going on forever and ever as a mega thread... eventually.
If a player ceases to post for an amount of time greater than 3 days, determined by the current GM, the GM may mod kill them and get around to making the turn.
If a GM ceases to post for 7 days, one of the players may make a new wish, which a forumite may grant to become the new GM, as normal.
Wishes must be posted in bolded purple, to really catch the eye. Actions must be posted in bold, though dialogue doesn't need to be.
I'll start. I wish dinosaurs returned to the world.