Well my guys and I would like to give you a little show of the Reward Zone game for the click exchange.
First the settings are accessed under the Click Exchange settings as shown below:

Once you hit that it takes you to the new settings page which is shown below:

Now, what this game does is give your members the option of 4 items to choose from. The options will either give them cash credits, ad credits, both types of credits, or nothing. They are set randomly so its not always the same button that gives a certain reward. You can choose the amount of cash, type and amount of credits and the frequency in which they will be given the chance of receiving the game. I would recommend it pretty low, like under 10% because each time they see a new ad in the click exchange they have the chance of receiving this game.
Now here is what the game looks like to the members:

Now of course the name of the site will automatically be added, but this view was taken on one of our test sites, LOL.