[Sonic 1 Github] How to make work the Giant Rings during a level instead of at the end

Well, I'm new, but I think this can be useful for some people, so, here we go

I see other rom hacks like Sonic AGX which puts the giant rings during the levels instead of after.

Well, here's my own code because i can´t found the giant ring code in the sonic 3 code

It should work in Hivebrain. Just search the equivalent routines or address

1) New flag

Before this, you need a unused address for make this work. For example $F601. that's the address i'm going to use (if you already use that address, search other unused address in https://info.sonicretro.org/SCHG:Sonic_the_Hedgehog_(16-bit)/RAM_Editing )
Anyways, at the end of Variables.asm you should write something like this

Code:

f_specials      = $FFFFF601    ; Special Stage flag

Now the game will know that f_specials is $FFFFF601

If you use Hivebrain, like theres no variables, change all the f_specials with your used address

2) Modify the code of the giant ring

go to _incObj/4B Giant Ring.asm and put this over GRing_Okay

Code:

GRing_Confirm:
                tst.b    (f_specials).w    ; did you already enter one to the special stage?
                beq.s    GRing_Okay    ; if not, branch
                rts

This looks useless, but i'll explain it later.

Oh, and also. do you see the "bne.s GRing_Okay" which should be at the very end of GRing_Main? Change it with

Code:

                bne.s    GRing_Confirm    ; if yes, branch

And copy this from GRing_PlaySnd (include it) until before GRing_Delete

Code:

GRing_Enter:
                addi.b  #$01, (f_bigring).w
        move.w    #sfx_GiantRing,d0
        jsr    (PlaySound_Special).l    ; play giant ring sound

GRing_ChkSS:
        tst.b    (f_bigring).w    ; has Sonic jumped into    a giant    ring?
        beq.s    GRing_Restart    ; if not, branch
                move.b    #id_Special,(v_gamemode).w ; set game mode to Special Stage (10)
                add.b  #01, (f_specials).w
        bra.w    GRing_Animate
GRing_Restart:
                rts

And remplace all GRing_PlaySnd with GRing_Enter

3) 1 special stage by act

It works but you can go to the giant ring just once in the whole game. So lets change it

Go to _incObj/0D Signpost (Edit: Also in Level_ClrVars 3 in the main Sonic.asm file) and put this after the label GotThroughAct

Code:

                clr.b   (f_specials).w

Did you remember this?

Well, that will let you go to the special stages once per act.

Conclusion

I think that's it. That's how i make work the giant rings during the act instead of after.

If you have some suggetion, say me and i will edit the tutorial