I took a gander at the JP Chaotix manual on a whim and there's some fairly interesting info in it about Metal Sonic, Amazing Arena and Techno Tower. According to this; Dr Eggman recovered both Metal’s main and sub CPU’s after he was destroyed in a fight with Sonic (This is most likely a reference to the Stardust Speedway race in CD). Which if true means that Chaotix!Metal Sonic still has the “mind” of CD!Metal Sonic. They were placed into a spare fuselage and reborn with Dark Ring Power. His construction now includes a Plasma Plasner, allowing him to use the Plasma Pulse attack (For the record, this is what MS will do to you if you stand idle in a stage for too long). Amazing Arena is described as a Fun House, you know, the sort of Fun Houses you often see at fairs. It uses time and video projections. The video theme seems to be carried across to one of the unnamed Badniks. Specifically the camera tripod badnik that does nothing but scuttle about. Techno Tower is considered to be the symbol of Newtrogic High Zone. It has a purpose in that it is actually a place where light energy is gathered. This is pure speculation but knowing this info, perhaps the reason why Newtrogic High Zone has such vivid lighting on the title screen is due to Techno Tower's purpose in gathering light energy - It probably repurposes it to make the place glow beautifully; This may also explain why there's so much machinery in the area where the boss is fought; It's all there to collect the light energy. The boss even uses white lasers (Light?) to attack. I dunno, I just love the detail the developers put into some zones, how they give them a specific purpose.