Yes.
Family Guy Back to the Multiverse - 2012 VG is rated/received certificates of: Singapore:ADV
Family Guy Back to the Multiverse - 2012 VG was released on: USA: 20 November 2012
No.
Probably.
Road to the Multiverse
Family Guy - 1999 Road to the Multiverse 8-1 is rated/received certificates of: USA:PG-13 (1999)
No. It is only available for PS3, XBox 360 & Microsoft Windows.
The Road to the Multiverse
There is a full game. For free
You just have to play the game. The other characters are unlocked as you progress through the game.
Yes
Presuming you're referring to Back the Multiverse game, it's fairly simple... go to the "Options" menu & select "Cheat"