I've just released the first version of Mineral Waters, a new game in Dragon's Tale where veteran players place "bets" on new players.
If you enter the game as a new player and interact with existing players, there is a very good chance that you will be gifted some Mineral Waters. These are special drinks that cost the provider nothing, but pay off in Bitcoin to the one receiving them. Veteran players get several each day to distribute as they see fit.
Each time a veteran player gives you a Mineral Water, they're betting that you will eventually do a certain amount of gambling in the game. If they're accurate, they can win in-game and real-life prizes.
The Bitcoins in the drink are provided by the house: We're placing a bet that you'll love Dragon's Tale and join our little community. We've been in continuous operation since October 2010, and are, I believe, the longest running Bitcoin based business in the world.
Native clients for Windows, Linux and OSX are available on
http://www.dragons.tl