How can I port Knuckles to base Sonic 2

[GamingUnleashed]

I wanna port knuckles into regular sonic 2 because I went to make a rom hack that fixes bugs & restores stuff & I tried the tutorial on Sonic Retro & It didn’t work since it’s outdated so I just wanna know how can I port it

[Clownacy]

The Knuckles in Sonic 2 disassembly currently marks every difference between KiS2 and the original Sonic 2, like this:

    if gameRevision=3
	; KiS2 (Knuckles): More Super Knuckles palette stuff.
	moveq	#0,d0
	move.w	d0,(Palette_frame).w
	move.b	d0,(Super_Sonic_palette).w	; stop palette cycle
	lea	(CyclingPal_SKRevert).l,a0
	bra.w	.loadPalette
    else
	; run frame timer
	subq.b	#1,(Palette_timer).w
	bpl.s	.return
	move.b	#3,(Palette_timer).w

	; decrement palette frame and update Sonic's palette
	lea	(CyclingPal_SSTransformation).l,a0
	move.w	(Palette_frame).w,d0
	subq.w	#8,(Palette_frame).w	; previous frame
	bcc.s	+			; branch, if it isn't the first frame
    if fixBugs
	move.w	#0,(Palette_frame).w
    else
	; This does not clear the full variable, causing this palette cycle
	; to behave incorrectly the next time it is activated.
	move.b	#0,(Palette_frame).w
    endif

To port Knuckles, find that relevant code modifications and copy them over to your disassembly. Alternatively, you can do what I did for my 'Sonic the Hedgehog and Miles Tails Prower the Fox in Knuckles the Echidna in Sonic the Hedgehog 2' ROM-hack and modify a copy of the KiS2 disassembly to restore Sonic and Tails instead. I'm not sure which is easier. In either case, you'd need to add some custom code to each section of modified code to make it run either the Sonic 2 or KiS2 version of the code based on whether the player is playing as Knuckles or not.

[GamingUnleashed]

I got knuckles to work in base sonic 2 now i need help with the special stage