How to restore the unused LBZ Escaping Eggman in Sonic 3 & Knuckles

We know you can use the Game Genie code to make Eggman escape to the Death Egg in Launch Base Zone Act 2 after beating Big Arms in Sonic 3 Alone which He goes to the left and see the bad or good ending. Ever since SEGA made the code and didn't have time to implement it and used it as a Game Genie code. But that code got removed and was not shown in Sonic 3 & Knuckles in which Sonic &/or Tails see the Death Egg fall with the camera stop with the platform moving and it takes you to Mushroom Valley (Hill) Zone. It even made an Easter Egg appearance in Sonic Origins along where Eggman goes to the right instead with the LBZ Death Egg Transition from Sonic 3 Complete. So, why not restore it in that lock-on game. I'll be using the old GitHub Disassembly version for this tutorial.

First, in the 'ChildObjDat_7380C' label change the 6 to a 7 and add this at the end of $B01C.

Code (Text):

1. ChildObjDat_7380C:dc.w 7
2.         dc.l loc_72E9E
3.         dc.w 0
4.         dc.l loc_72E9E
5.         dc.w $F028
6.         dc.l loc_72E9E
7.         dc.w $9000
8.         dc.l loc_72E9E
9.         dc.w $B828
10.         dc.l loc_72E9E
11.         dc.w $1810
12.         dc.l loc_72E9E
13.         dc.w $DCF8
14.         dc.l loc_72E9E
15.         dc.w $B01C
16.         dc.l Obj_FleeingRobotnik
17.         dc.w $661C

Next, after the 'word_74E7C' label add this code.

Code (Text):

1. Obj_FleeingRobotnik:
2.         lea    ObjDat3_51F9C(pc),a1
3.         jsr    (SetUp_ObjAttributes).l
4.         move.l    #loc_51BB6,(a0)
5.         bset    #0,4(a0)
6.         move.w    #$7B20,$3A(a0)
7.         move.b    #$30,$25(a0)
8.         move.w    (Camera_X_pos).w,d0
9.         addi.w    #$60,d0
10.         move.w    d0,$10(a0)
11.         move.w    d0,$30(a0)
12.         move.w    (Camera_Y_pos).w,d0
13.         addi.w    #$100,d0
14.         move.w    d0,$14(a0)
15.         move.w    d0,$34(a0)
16.         move.w    #$800,$18(a0)
17.         move.w    #-$3C0,$1A(a0)
18.         move.b    #4,$40(a0)
19.         move.l    #ArtScaled_FleeingRobotnik,$42(a0)
20.         move.b    #1,$3E(a0)
21.         jsr    (Perform_Art_Scaling_S3).l
22.         jmp    (Draw_Sprite).l
23. ; ---------------------------------------------------------------------------
24.  
25. loc_51BB6:
26.         bsr.w    sub_51E3A
27.         bsr.w    sub_51DEA
28.         bsr.w    sub_51E10
29.         jmp    (Draw_Sprite).l

Then, after the '$EEE' in 'word_7509E' add this before 'ObjDat3_750B6'.

Code (Text):

1. Perform_Art_Scaling_S3:
2.         clr.w    ($FFFFF740).w
3.         move.l    a0,-(sp)
4.         jsr    (Init_ArtScaling).l
5.         movea.l    (sp)+,a0
6.         move.l    a0,-(sp)
7.         move.w    $A(a0),d0
8.         jsr    (sub_2468A).l
9.         movea.l    (sp)+,a0
10.         move.w    ($FFFFF740).w,d3
11.         lsl.w    #4,d3
12.         move.l    #Kos_decomp_buffer,d1
13.         move.w    $3A(a0),d2
14.         jmp    (Add_To_DMA_Queue).l
15. ; End of function Perform_Art_Scaling
16.  
17.  
18. ; =============== S U B R O U T I N E =======================================
19.  
20.  
21. sub_51DEA:
22.         move.w    $18(a0),d0
23.         addi.w    #-$28,d0
24.         cmpi.w    #-$80,d0
25.         blt.s    loc_51DFC
26.         move.w    d0,$18(a0)
27.  
28. loc_51DFC:
29.         move.w    $1A(a0),d0
30.         addi.w    #8,d0
31.         cmpi.w    #$40,d0
32.         bge.s    locret_51E0E
33.         move.w    d0,$1A(a0)
34.  
35. locret_51E0E:
36.         rts
37. ; End of function sub_51DEA
38.  
39.  
40. ; =============== S U B R O U T I N E =======================================
41.  
42.  
43. sub_51E10:
44.         bsr.w    sub_4B30A
45.         move.w    $30(a0),d2
46.         move.w    $34(a0),d3
47.         moveq    #0,d0
48.         move.b    $40(a0),d0
49.         addq.w    #4,d0
50.         move.l    #$100,d4
51.         divu.w    d0,d4
52.         sub.w    d4,d2
53.         sub.w    d4,d3
54.         move.w    d2,$10(a0)
55.         move.w    d3,$14(a0)
56.         rts
57. ; End of function sub_51E10
58.  
59.  
60. ; =============== S U B R O U T I N E =======================================
61.  
62. sub_4B30A:
63.         move.w    $18(a0),d0
64.         ext.l    d0
65.         lsl.l    #8,d0
66.         add.l    d0,$30(a0)
67.         move.w    $1A(a0),d0
68.         ext.l    d0
69.         lsl.l    #8,d0
70.         add.l    d0,$34(a0)
71.         rts
72. ; End of function sub_4B30A
73.  
74.  
75. ; =============== S U B R O U T I N E =======================================
76.  
77.  
78. sub_51E3A:
79.         subq.w    #1,$1C(a0)
80.         bpl.s    loc_51E62
81.         moveq    #0,d0
82.         move.b    $23(a0),d0
83.         addq.b    #1,d0
84.         cmpi.b    #6,d0
85.         bhi.s    loc_51E80
86.         move.b    d0,$23(a0)
87.         add.w    d0,d0
88.         move.w    word_51E86(pc,d0.w),$1C(a0)
89.         add.w    d0,d0
90.         move.l    off_51E94(pc,d0.w),$42(a0)
91.  
92. loc_51E62:
93.         subq.b    #1,$25(a0)
94.         bpl.s    locret_51E7E
95.         move.b    #4,$25(a0)
96.         move.b    $40(a0),d0
97.         addq.b    #1,d0
98.         bmi.s    locret_51E7E
99.         move.b    d0,$40(a0)
100.         bsr.w    Perform_Art_Scaling_S3
101.  
102. locret_51E7E:
103.         rts
104. ; ---------------------------------------------------------------------------
105.  
106. loc_51E80:
107.         jmp    (Go_Delete_Sprite).l
108. ; End of function sub_51E3A
109.  
110. ; ---------------------------------------------------------------------------
111. word_51E86:    dc.w $20
112.         dc.w $20
113.         dc.w $10
114.         dc.w 8
115.         dc.w 8
116.         dc.w 8
117.         dc.w $200
118. off_51E94:    dc.l ArtScaled_FleeingRobotnik
119.         dc.l ArtScaled_FleeingRobotnik
120.         dc.l ArtScaled_FleeingRobotnik+$1000
121.         dc.l ArtScaled_FleeingRobotnik+$2000
122.         dc.l ArtScaled_FleeingRobotnik+$3000
123.         dc.l ArtScaled_FleeingRobotnik+$4000
124.         dc.l ArtScaled_FleeingRobotnik+$5000
125. ; ---------------------------------------------------------------------------

Finally, insert this code after the even on the 'ArtKosM_Technosqueek' label.

Code (Text):

1. ArtScaled_FleeingRobotnik:    binclude "General/Sprites/Robotnik/Robotnik Fly Scaled.bin"
2.     even

You also need to add this as well after the whole 'ObjDat3_7375A' label.

Code (Text):

1.  
2. ObjDat3_51F9C:    dc.l Map_ScaledArt
3.         dc.w $3D9
4.         dc.w $300
5.         dc.b $20
6.         dc.b $20
7.         dc.b 0
8.         dc.b 0

Save the ASM, build the rom, input the Level Select code in Angel Island Zone Act 1, go to Launch Base Zone Act 2, Defeat the Egg Rocket, finish the Act, and watch the cutscene to see if it worked. You can also do this if you want to restore Big Arms for Sonic &/or Tails. If you have the newer Disassembly, it's (_unkF740).