One of the exciting things about kadokado games is the rewards system. Just by playing the games you will automatically earn kadokado points. These points can be spent to buy rewards, some of which are pretty cool. Others are rather mundane.
The kadokado reward that allows you to post in the forums, for example isn't all that great, but the ability to "buy" new games is pretty cool. Not all of the games are enjoyable for everyone, so you get to choose the games that you like the most.
Other things you can buy include an amazon gift card, and the ability to join or start a clan. The gift cards are, of course pretty cool though they are very expensive. I have personally verified that the gift cards are real and do in fact work just fine through amazon.