You know what really builds dexterity? The search button.
[Founder of the Ibanez S players club.] Pm Me to Join
I think playing your guitar will help you more than guitar hero will when it comes to playing a real guitar.

To improve speed and dexterity, just play scales up and down using a metronome if you need it. Play them u pand down, side to side.

Practice is the key. There are no shortcuts when it comes to guitar.
chromatics bending every note
-Jackson Soloist: SL2HT (On its way to Canada)
-Epiphone Les Paul Gothic w/ SD JB (Process of Modding)
-Art & Lutherie Spruce CW
-Dunlop Crybaby (Process of Modding)

For Sale
-Peavey Valveking 112
pm me for info
If you like to play a crappy video game more than a real instrument then you're on a wrong site pal...

The only way to build dexterity is correct practice. You need to play until you can't even move your fingers. There's no shortcuts, it's hard work.