The area is in the desert close to Eggman's secret base, a pyramid, and there is a large amount of water in this stage. The lagoon is home to a lot of wildlife including two giant Turtles. Rouge can rescue one from a pair of G.U.N. Hunter robots and use it to get to the other part of the stage by riding on its back, while the other can be used to get to the Oasis Prison.
These ruins have a mysterious wind cycle and secret walls to dig through once Rouge discovers the Level Up Item Pick Nails.
Rouge makes her debut by trying to steal the Master Emerald from Angel Island. Knuckles, the guardian of the Emerald, tries to stops her. In the midst of their arguing, Dr. Eggman arrives and steals the Emerald. To prevent the Master Emerald from falling into the wrong hands, Knuckles shatters the Emerald into pieces. After more bickering with Knuckles, Rouge leaves to collect some of the Master Emerald shards.
The pieces of the Master Emerald are placed in random locations each time the stage is played. To find them, the player must use the radar at the bottom of the screen. As they get closer to the currently-tracked emerald shard, it turns from green to yellow to red and the "ping" sound speeds up. The player can also activate the Hint Boxes for hints, but doing so subtracts points from the score (making it more difficult to get A Rank).
Collect 100 Rings
This is one of the easiest missions in the game. There are more than enough rings in the first area, so it is not necessary for the player to use the Turtle. The various ledges and airspace around the tall, dark pillar have an especially large amount of Rings.
Find the lost Chao
The Iron Boots, Pick Nails, and Mystic Melody are required to complete this mission. Breaking the Iron containers along the southern wall of the top floor reveals a painting. The player must dig into it, which will cause them to land in a room containing an Ancient Ruin and a door. They must play the melody near the shrine to open the door, then walk through it. Jumping into the blue swirl will transport the player to the Lost Chao's location.
Find the missing Emerald pieces in 3:30
Because this stage is not very large, completing this mission is not difficult. The player should quickly check the starting area, then head to the Big Oasis area if there are no shards to be found.
Clear Hard mode
The Treasure Scope is required to complete this mission. In hard mode, the pieces of the Master Emerald are always in the same place. To reach the first piece, the player should begin by destroying the wooden crate on the second ledge above the starting point. They must launch from the exposed Spring, and at the height of the bounce, glide forward to grab the Emerald.
For the second shard, the player must climb into the large picture on the east wall and dig into the cross bar of the scale. A hidden Spring will launch the player into the Emerald. The final piece is located in the Big Oasis area. The player must take a ride on the turtle, turn on the Treasure Scope, and drop into the water. They should look on the underside of the floating center island, and the player will see a spring they can bounce off of to snatch the last piece.
In the second section of Dry Lagoon, dive into the water and grab the Turtle. This Turtle will eventually go into the underwater tunnel. about halfway the tunnel Big's tail can be seen sticking out of the sand. In Hard Mode, Big is moved slightly backward, but his tail is still the only part of him visible.