Mad World [Wii - Beta / Prototype] - Unseen64

Celine linked us to the official Platinum Games Site / Blog, in which they have wrote some interesting posts about the development of their game: originally Jack

Mad World [Wii - Beta / Prototype] - Unseen64

Beta/Concept versions of games or lost works that you wish became fully realized, Page 3

Editing Mario Takes America (lost build of cancelled Philips CD-i edutainment game; 1992-1994) - The Lost Media Wiki

A complete list of Beta & Cancelled Video Games

Beta + Cancelled hack & slash Video Games - Page 3 of 5 - Unseen64

RaggaR's Video Game Collection and Reviews - Rate Your Music

Nintendo – Unseen64: Beta, Cancelled & Unseen Videogames!

Beta + Cancelled Bio Hazard Video Games - Page 3 of 3 - Unseen64

Beta + Cancelled capcom Video Games - Page 11 of 12 - Unseen64

Madworld - PC Dolphin emulated version versus original Wii version comparison video

The Phantom: The Ghost Who Walks [GBA - Unreleased] - Unseen64