Tonic Trouble (also know as ED or HED during the early development) is a 3D platform game created by Ubisoft for the Nintendo 64 and PC. As you can see from the beta images in the gallery below, the developers tried to create a character design similar to Rayman for the main hero. Rather than rely on exploration as in Mario 64, Tonic Trouble proposed a rather linear gameplay, which was a direct translation into three dimensions of the traditional two-dimensional platform concept.
In the early beta images released on various magazines and websites, we can notice a graphic much more detailed than the final one on the Nintendo 64, as probably these screens were taken from various target renders and tech demos. We dont remember the game very well, but it’s also possible that some of the places seen in the beta screens were not in the final game.
The N64 version had many noticeable differences from the PC version, like a substantially different opening due to the lack of processing power needed to render cutscenes and different music in certain places. The game was going to be released before Rayman 2: The Great Escape but eventually was released months after. [Info from Wikipedia]