Crash Bandicoot - Introduction and General differences
Introduction
Games go through several stages during development, with the final release being the only one commercially available to the general public. Unfinished game prototypes are sometimes leaked onto the Internet, and even though that isn't supposed to happen, it makes it easy for anyone to distribute illegal copies of them.
Researchers got a hold of a Crash Bandicoot prototype some 13 years after the game was released. Featured here are many removed or changed elements found in that prototype.
You can view an extensive side-by-side comparison of each level in this YouTube playlist by dessertmonkeyjk.