Sonic Game

Core Concepts

 * Title is Sonic Isolation.
 * Dreamcast aesthetic.
 * 3D Sonic game.
 * Major shift in gameplay style.
 * 3D Blast is a major inspiration, in that levels are linear, but not "run on a track and occasionally stop" linear.
 * Exploration-focused.
 * A hub world similar to Adventure.
 * Chao Garden.

Story

 * The game opens with Sonic fighting Eggman above an area known as the Gemstone Isles, with all seven Chaos Emeralds in hand.
 * However, Eggman's ship is destroyed in the process, stranding the two on separate ends of the island chain and scattering the Chaos Emeralds.
 * Traditionally, it's near-impossible to leave the islands normally due to the dense fog,
 * To escape, Sonic has to gather the Ring Tablets, large objects that power the Tropogate, an ancient gateway capable of providing transit outside of the isles.
 * Eggman is trying to collect the Ring Tablets as well, and will often attempt to hinder Sonic's progress.
 * The main hub of the game is Crystal City, the one location in the isles where people have settled down.
 * Some of Sonic's friends will later arrive on the isles.
 * Tails comes in via the Tornado fairly early and will help transport Sonic between islands.
 * Knuckles is first found relaxing in Shoreline View Zone, and will often challenge Sonic to races, giving him Light Orbs if he wins.
 * Amy is captured by Metal Sonic (a la Sonic CD) in Icy Wasteland Zone. She takes up residence in Crystal City afterwards.
 * Big the Cat is found fishing in Pirate Cove Zone, but is eaten by an orca shortly after.
 * Shadow, Rouge, and E-123 Omega can be found exploring the various Zones, and will often point out hidden spots where Light Orbs are located.
 * The Chaotix are in Crystal City, often giving Sonic small missions in the city that reward Light Orbs.
 * Cream runs the Chao Garden.
 * Mighty the Armadillo is a rival character who will often attempt to hinder your progress.
 * When Eggman's ship was destroyed, many, many robots fell down onto the isles. They're trying to regroup, and each island has its own group of Eggman-loyal robots.
 * Meant to lead into my Super Mario Bros. Z reboot.

Gameplay

 * Levels lack time limits, and are more open, much like 3D Blast.
 * To progress, Sonic has to collect Light Orbs, which are necessary to power up Orb Gates that will transport you through the level.
 * A certain amount of Light Orbs is needed to fully complete the level, though more can be found.
 * Light Orbs are obtained by running into them, collecting them from enemies, or from item boxes.
 * Enemies now give you a few Rings when defeated, like the Advance games.
 * Special Stages are accessed in a similar vein to the "small world" areas from Super Mario Odyssey, and utilize the old Sonic platforming style, with boosting and the like.
 * However, there are no rings in the Special Stages, so one hit means you're done.
 * The Special Stages are also designed to resemble the cancelled Sonic X-treme in terms of level design.

Sonic's Moves

 * Spin Jump (normal jump with the B button)
 * Rolling Attack (activated by pressing Y whilst moving)
 * Spin Dash (Y whilst standing still)
 * Drop Dash (Y whilst in the air)
 * Homing Attack (Y when the targeting cursor appears)
 * Stomp (B whilst in midair)
 * Insta-Shield (X while in midair)
 * Super Peel Out (Press X whilst standing still)
 * Shockwave
 * A new move. When you press X after running, you'll immediately stop before letting loose a shockwave of energy that will destroy enemies in front of you.

Zones
Each Zone has a "buildup" storyline that takes place in Crystal City, usually revolving around how to get there
 * Jungle Fields Zone
 * Spiked Mountain Zone
 * Shoreline View Zone
 * Magma Valley Zone
 * Icy Wasteland Zone
 * Steelworks Zone
 * Broken Castle Zone
 * Pirate Cove Zone
 * Cloudy Approach Zone
 * Egg Destroyer Zone