My close-to-original cover of the Game Gear/Master System 8-bit version of Green Hill Zone from Sonic The Hedgehog 1.
My V2 version was nowhere near accurate at all. This time I made a cover of this in V3 Standard start from scratch.
The trick I used for getting the twangy square wave sound you hear in the song is to place 1/32nd notes in front of the existing ones.
If you don’t believe it’s accurate, listen to this.

I even looked at MIDI files of the song to help me out here.