In this question on Sonic Mania, it says that you'll unlock something called the "D.A. Garden" if you get a certain number of medals from the blue sphere mini-game. What is that and is there a reason behind the name?
Sonic Mania – Understanding the D.A. Garden
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Best Answer
The D.A. Garden is a feature included in a few Sonic games as an extra. It's essentially an interactive sound test (like a visualizer). This name was first used for the Sound Test in Sonic CD, though I haven't seen any explanation for why it was named that.
From this article explaining the extras:
Also, from the IGN Cheats and Secrets guide for Sonic Mania: