Best games and apps for 6-8 year old

Hi people, just bought a playbook for my 6 year old and have been looking in forums for things that he will like. Games that lots of people seem to like are run the crowd, pew pew, burn the city, smash cops, fruit slash, frisbee forever, asphaltt 6, gravity wars, paper plane, dillo hills, protect the cheese, xtreme snowboarding, doodle blast and ifishing lite. I would like any advice on these games or others, including any pay games, to see if they are suitable for him or which other games/apps people would suggest. I bought this for christmas and would like to put games / apps on for him to use when he opens it. Thanks in advance for any help,. Ps. Any other useful tips would be grateful as i have never had a tablet myself.

My 5-yr-old grandson absolutely loves Burn the City. He asks to play it every time he comes over. He not only gets to be a fire-breathing dragon but he has to work out in his mind how to angle his shots and in what order to do things to clear the screen. I think it's great for his mind and loads of fun at the same time. I highly recommend it.

tagging along

Mine likes the game of life, Plants vs Zombies, Fruit Slash, tiny bird, pinball deluxe, photo puzzle, fly squirrel fly 2 and the critters games. She also really likes Tic Tac Toe Free.

Here are some of the games my 4 & 6 year olds have on their PlayBooks:
Free Chess
Space Worm
Make Waves
Rotate & Roll
Psycho Car Game
Drop Down
Pixelated
Bubble Burst
Crazy Copter
Spider Catch
Adventure of Ted 2
Robotek
Tomb Escape
Eat all Brains
Crush the Zombies
Monster Fighter
Free Solitaire
Galazer
Chimpact
CreaVures
Radiant Defense
Stick Tennis
Asphalt 6

For 6-8, I'd recommend ABCDay (there is a free version to try)
Not only it's fun, but also educational. :D