From Sonic Retro
|Fifth level, Tails Adventures|
|Location: Cocoa Island|
|Level theme: underground/cave|
|Boss: Mecha Golem|
|Underwater areas: Yes|
| Non-English names:|
|← Lake Rocky | Green Island →|
Cavern Island is the fifth level of Tails Adventures for the Sega Game Gear, coming after Lake Rocky and before Green Island. Unlike most levels in Tails Adventures, Cavern Island is not one that the player will have to keep coming back to as new items open up new routes; Tails can clean out the area on the first visit.
After making it through Lake Rocky in the Sea Fox, Tails arrives in a cavernous island riddled with a submarine labyrinth of caves and tunnels. Its tileset is the same one previously seen in Volcanic Tunnel, although the caverns are filled with water rather than magma, and many of the underwater tunnels have strong riptides that will sweep Tails to different areas. While the water will slow Tails' movement and prevent him from flying, he cannot drown in this game unlike other Sonic games.
Although the regular avian troops of the Battle Kukku Army are nowhere to be seen (except for the pilot of the Mecha Golem, a bulbous bipedal robot with an extensible arm), their robotic minions are all over the place, with Nezu mouse-bots scuttling back and forth and mechanised bats terrorising the cave roofs.
Items to pick up in Cavern Island include:
|Mine — Found in the first area, atop a watery shaft before the Spring. Push the Spring so Tails can jump to it, or have the Remote Robot fly up to it.|
|Napalm Bomb — Near the end of the second area, behind a destructible wall by collapsing bridges.|
|Anti-Air Missile — Dropped by the Mecha Golem after defeating it.|
|Nezu — Mouse robots that drop bombs.|
|Bat Robot — Bat robots that swoop down from the ceiling.|
|Drill Mole — Mole robots that burrow from the ground.|
- Tails Adventure page at The Green Hill Zone has more information on all the Tails Adventure areas.