Single Status Update
I discovered something a few days ago in Sonic 1 mobile which I'd never seen before (this may be well known and I was just unaware of it for six years...).
By accessing Sonic 1's level select, then playing "07" on the sound test, then selecting "special stage" you get a custom special stage. Not to be confused with the seventh special stage created for the mobile version (which you can access by entering "06" in the sound-test then selecting special stage). This customer special stage litterly just has the letters which spell "C U S T O M". There are no rings, no "goals" and no chaos emerald awarded. If you fall off of the letters then you just keep falling for eternity.... I imagine this was just created as a kind of test level when Taxman & Stealth were working on the seventh special stage.
It's kinda neat