What elements would you take from the original Sonic Trilogy, the 'weird titles' like Sonic CD and Sonic Adventure to make a collaborative hybrid game? I always pictured a 2.5D Sonic game with a character selection of Sonic, Tails, Knuckles, Metal Sonic and Dr Robotnik. Playing as Sonic, Tails or Knuckles would be like Sonic 3 & Knuckles but with the Time Travel from Sonic CD, combined with evil mechs that you have to destroy in different sectors of time. Playing as Dr Robotnik allows the player to visit the 'engineering lab' and create custom boss machines to use against Sonic and co in each zone. Playing as Metal Sonic starts the player off at the final stage (Robotnik's base) and they must make their way to the first level (typical ghz, angel island type level) to intercept Sonic, Tails and Knuckles at the 'beginning' of the game. Each hero character would have their own storyline akin to Sonic Adventure, seeing everything from each character's individual perspective, with separate paths that branch off from the main storyline. There would also be side quests that could be completed in 'hub worlds' that rather than being separate areas actually blend with the action stages seamlessly (e.g. you have to travel through a city hub world to encounter Robotnik in a secret extension to a train station for a boss encounter (BOSS ACT)). Or a mission where Metal Sonic must use a night vision scanner to find small traces left behind by Sonic. (I know that contradicts what I said earlier but it's just an example). Anyway, that's my idea. A game that all flows together with minimal loading screens and combines all the elements I stated above. What elements would you combine for the Ultimate Hybrid game?