Hearthstone has proven to be very addictive even for someone like me who has never played any TCG or CCG ever. As I won a match, I was greeted with the Chicken Dinner achievement which says: “Win 100 games in any mode”. That includes all the characters you leveled in the Practice Mode — which gives experience up to level 10. I had leveled about 5 characters to level 10. Won some, lost some.
The shocker really was the reward for the Chicken Dinner achievement — a whooping 300 Gold!!! One of the things this gold can be used is to buy 3 packs of cards at the Hearthstone in-game store, or two buy two entries into the Arena Mode.
With 300 Gold, you can click the In-Game Store icon to purchase 1 Pack with 100 Gold. If you wish, you can buy three packs with that amount of gold. In each pack you get 5 Expert Cards and at least one card is guaranteed to be either a rare or better.
With 300 Gold, you can have access to two Arena Mode entries. Each entry into the Arena will give you access to new card rewards. You can win as many times as you are able, but you can only lose 3 matches then your ride on the Arena is finished. The more matches you win, once you lose three times the better the card rewards and quality chances.