Guitar Hero III
If your little bro mastered the five button mash of the original and Guitar Hero II, have him prove his worth to the world with Guitar Hero III. With almost twice as many songs as before (and most from the original artists), Guitar Hero III lets you duel licks with other people over the internet and post your achievements online. Available for Xbox360, Nintendo Wii and Playstation 2 and 3.
Available from Red Octane starting at $90.