Like many little games on Xbox live, I just decided to download Puzzle Quest while playing something else, there is nothing wrong with some variety. I am so glad I did, for only 400 gamer points (is about £3.40), you can get the full version of Puzzle quest on your xbox.
The game is an RPG style puzzle game, in which you choose your character class (which will give you unique abilities which can be cast during play) and move around a map with your character completing quests. These inevitably lead to combat with other non-player characters (NPCs). You then enter battle using a "connect four" (except its three upwards) to either collect experience points/Mana or do damage to your opponents. Depending on the mana you collect up, leads to you being able to cast more spells which aid you while playing!
It is a great fun little game, and I cant be happier for the price. Its free to try so I would definately recommend downloading it!