Marine Ruin Zone

Marine Ruin Zone is the third zone in Sonic the Hedgehog 5. It's unlocked after defeat Eggman in Botanic Woods Zone. It's an underwater ruin type of level. It's inspired by Tidal Tempest from Sonic CD, Hydrocity from Sonic 3, and Aquatic Ruin from Sonic 2. Mighty and Knuckles will be unlocked here after beating Eggman.
=== Act 1 ===
The first act. It takes place inside the ruins. It contains flooding waters, waterfalls, and arrows from the Aquatic Ruins. This act contains gimmicks like water slides and transportable bubbles. At the end of the act, Fang will make a whirlpool and tidal waves causing the player to flee to the outside the ruins.
=== Act 2 ===
This act takes place outside of the ruins. In the background of the level, you can see the Botanic Woods Zone. It contains waves, whirlpools, falling pillars, and flooding waters, and water geysers. At the end of the level you will have a little fight with Mighty and Knuckles who each take four hits to defeat.
== Badniks ==
Mighty and Knuckles: Two allies from Angel Island. They were both tricked by Eggman that Sonic stole the Master Emerald (Mighty sort of became suspicious ) . Mighty can make shockwaves, and could spin around while Knuckles acts like he did in S3 and K. 
Quake Drill: A robot that can ambush the players from the floors of the ruins
Octotric: An electrical octopus. Its tentacles can turn electric periodically.
Night-creeper: A bat that usually comes in groups. It always on the ceiling sleeping.
== Boss ==
Once again,Eggman is back for a rematch. He will be in the Egg Mobile modified into a submarine. When it rises out of the water, it shoots out missiles at Sonic. After 2 missiles, the sub leaps out of the water shooting out orbs and goes to the other side of the battlefield. After 6 hits, it shoots out a giant missile causing half of the floor to crumble. After 2 more hits, it explodes and Eggman flees to the next zone.