Egg Quarters

Egg Quarters is the fifth stage of the Dark story in Sonic Adventure 2 and ''Sonic Adventure 2: Battle. ''Rouge is playable in this stage. This stage is also notable for enemies called Egg Beetle, which roam around the whole stage. This level is similar to Knuckles' Death Chamber.

Upgrade
The Pick Nails can be found in a room in the Egg Fish Chamber.

2P Mode
In 2P Battle there are no Egg Beetles. Both players will start in the Egg Fish Chamber. The room where the Pick Nails would've been in is accessible, and the path between the Egg Scorpion and Egg Snake Chambers is blocked off.

Trivia

 * The name of this level is a pun on the word "Head Quarters" which is a word used for a base.
 * Egg Quarter's and Death Chamber's stage layout is almost the same, this is probably because Death Chamber is Knuckles' version of this stage albeit without the robot searching for him.