I think that when all of the current cards have been up for grabs in challenges, Kong should make ALL the card challenges available for 1 month (maybe too much? One Week?). Now that would increase their site traffic!
We should be able to buy cards with Kong Points. That way, newer players would first play other games to get points to buy cards, and it would increase the time they spend on the site. And its just stupid, when people chose the ''ultimate'' starter cards because they knew the good combos because of the beta. A shop would definitely increase thee fun, as long as the cards are balanced, otherwise everyone would play the same cards. Make the cards cost like 250-300 points and it would be good. Also, trading.
The medium badge is easy, just dodge everything but the yellow shapes and the purple shapes. Did it that way to get the medium badge and THEN started playing. I had the points for the hard badge in no time