Newtrogic High Zone is the setting for most of Chaotix - with the exception of the first level, Isolated Island, which depicts Knuckles and Espio's approach to the area. The US and Japanese manuals tell completely different stories about the Zone's provenance, but the latter states that it's a resort spot where a fortress was constructed by Dr. Eggman in order to (somehow) expedite his search for the Chaos Rings. It is presumed to be destroyed after the the events of the game.
Functioning as a sort of playable options screen for Chaotix, Newtrogic High Zone's entrance, known as World Entrance (ワールドエントランス) in the game's stage select and manuals, is where the player starts on loading up a save file. Upon spawning at the entrance, the player(s) will be greeted with two signs with "PLAY" and "EXIT" on them. Following the "PLAY" sign will lead the player(s) to the other rooms at the entrance, while passing the "EXIT" sign will end the game and return the player(s) to the title screen. If saving has been set to "Manual", the player(s) will need to pass the "EXIT" sign to save their game.
Following the "PLAY" sign will lead the player(s) inside a building and to the Attraction Information room, which tracks their progress in each of the areas so far. From here the a second member of Chaotix can be plucked from the Combi Catcher in the next room, and the semi-random level selector determines which of Newtrogic High's five constituent areas are to be played next following that. To select an area, a player must hit the bumper on the mechanism to slow the roulette to a stop. Once the stage has been chosen, the player(s) will automatically perform a Spin Dash as a launcher catapults them to their destination.
The apparently harmless level select machine ends up functioning as the penultimate boss battle, when Metal Sonic Kai interfaces with a hidden docking mechanism and pits the substance of the level itself against the player!
|Between each stage you visit the World Entrance. Here you can choose to end your game, select a new partner, and choose a new stage. Just follow the signs.
— Chaotix US manual
In other media
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3D artwork of Newtrogic High Zone
A close-up of the previous image, as depicted in one of the prototypes