While it may not be on the same level as the mainline Super Mario franchise, the Luigi's Mansion series has made a name for itself as one of the most unique Mario spin-offs to date. Instead of taking the characters on another platforming adventure or tossing them into an RPG, Luigi's Mansion has followed in the footsteps of Ghostbusters by tossing Luigi into all sorts of spine-tingling scenarios. But even though that blend has proven successful, it kind of feels like Nintendo may have forgotten about Luigi's Mansion 2 HD.