I'm super excited to share a hack I did to sonic 3 and knuckles that places the SOZ2 ghosts in every level. Here is the trailer video: Here is how I did it: Get a clean and newest Sonic 3 & Knuckles disassembly from https://github.com/sonicretro/skdisasm open sonic3k.asm 1.) First we want to Always Load The Ghost object regardless of the level and act. so in Obj_TitleCardWait2 change: Find AnPal_Load. Change: loc_2D86E: tst.b $44(a0) bne.s loc_2D8DC cmpi.w #$801,(Current_zone_and_act).w bne.s loc_2D88A jsr (Create_New_Sprite).l bne.s loc_2D88A move.l #Obj_SOZ_Ghosts,(a1) ; If new level is Sandopolis 2, then load the ghosts To loc_2D86E: tst.b $44(a0) bne loc_2D8DC ; LOAD GHOST REGARDLESS OF STAGE jsr (Create_New_Sprite).l bne.s loc_2D88A move.l #Obj_SOZ_Ghosts,(a1) 2.) Second we want to make AnPal_Load always animate the pallete as if it is soz2. This is important because soz 2 pallete animation routine effects _unkF7C3. Which is CRITIAL FOR THE GHOSTS OBJECT CODE TO FUNCTION CORECTLY. Change AnPal_Load: bsr.w SuperHyper_PalCycle moveq #0,d2 moveq #0,d0 move.w (Current_zone_and_act).w,d0 ror.b #1,d0 lsr.w #6,d0 move.w OffsAnPal(pc,d0.w),d0 jmp OffsAnPal(pc,d0.w) To: AnPal_Load: bsr.w SuperHyper_PalCycle moveq #0,d2 moveq #0,d0 move.w (Current_zone_and_act).w,d0 ;ALWAYS JUST TREAT STAGE AS IF SOZ2 FOR PALLETE ROUTINE move.w #$0801,d0 ror.b #1,d0 lsr.w #6,d0 move.w OffsAnPal(pc,d0.w),d0 jmp OffsAnPal(pc,d0.w) 3.) Third , we want to change the ghosts object code so that Last_star_post_hit is 1, in order so that the ghosts appear immediately. Last_star_post_hit is used in ghosts object code to determine for the ghosts to "appear". I will explain this more in another article. For now, chage ghosts code so that it begins setting Last_star_post_hit to 1 Obj_SOZ_Ghosts: move.b #1,(Last_star_post_hit).w move.l #loc_8F0CA,(a0) move.w #$120,$10(a0) move.w #$A0,$14(a0) You are all set now run build ( ie buildS3Complete.bat or which ever ) Technically the Obj_SOZGhostCapsule object and its art object aren't even needed. In fact, I have tried a build removing them completely, set the correct variables in SOZ2, and the ghosts STILL appear and work.
