Sonic Rivals 2 Test Rooms Discovered
A user named Woun has discovered the Sonic Rivals 2 test rooms.
The first test room contains a bunch of cards, then heads towards the save system. The second test room is a small knock out map with Knuckles which is full of springs. I would also like to note that the second test room seems to be using textures from the first Sonic Rivals game.
You can view a video showcasing the test rooms below.