Q: first of all, he's a guy, second, he's not really mature, he loves adventure games, and he wants a ps3 game.
A: Get him what he wishes but buy some educational video games that are fun. So that he doesn't even notice that he is learning. Old time board games are always good too. Monopoly on computer, Scrabble on computer Clue on computer Adventure story games on computer these kids live the computer. Try to also book him with books on computer or otherwise.