The Sandopolis Zone is one of the many varied regions of Angel Island.
Repairing the Death Egg
After his defeat at the hands of Sonic and Tails, Dr. Eggman's Death Egg crash landed on the floating island, resulting in the island sinking down to the water's surface. Eggman used the Launch Base Zone as his base for repairs and apparently messed with the systems. He eventually repaired his flying fortress and took off into the sky with Sonic and Tails pursuing him, resulting in another crash landing on Angel Island's Lava Reef Zone. Sandopolis Zone was the area that Sonic and Tails passed through after Flying Battery Zone, which eventually lead to Lava Reef Zone. During their visit, they encountered Guardian, who appeared from a giant pyramid that rose from the ground. (VG: SH3aK, SU: #64)
Knuckles later passed through Sandopolis Zone to reach Lava Reef Zone in pursuit of a fleeing EggRobo controlled by Dr. Julian Snively, Dr. Eggman's assistant, after multiple encounters on the island. During his visit, he, just like Sonic and Tails before him, encountered Guardian, who appeared from a giant pyramid that rose from the ground. (VG: S3aK, SU: #70)
- From a reader's perspective, this picks up from where the original Pre-Super Genesis Wave continuity left off.
Eclipse the Darkling later passed through the Sandopolis Zone with the Dark Arms, who were carrying the Master Emerald, in an attempt to reach the shuttle that Team Dark had landed in Launch Base Zone. Along the way, he encountered Guardian as one of the traps that Rouge the Bat has activated in an attempt to slow him down until Knuckles the Echidna and Shadow the Hedgehog could reach Eclipse. (SU: #70)
- Introduced in Sonic & Knuckles as the third (or ninth depending on the cartridge lock function) zone, act one is a vast desert while act two is spent mainly in a pyramid like complex.