Sonic and Knuckles Collection Cheats

Ok this is sweet. Start a new file on sonic three and knuckles as knuckles, go to one of the swinging vines at the beginning of the level grab on and press left 3x right 3x and up 3x. Then hold Alt + R to reset the game. Then at the starting screen scroll up and select the sound test option and then go to mushroom hill zone act one. Run to one of the pulleys and enter the same code while holding on a chime will tell you entered it right. Then hold alt+r and reset it again. go back to the sound test and then select the doomsday act 1. During this act knuckles will appear as a big glitch and it is easier to collect rings. Beat this act then afterwards when knuckles is floating to earth as soon as he is even with the top of the earth he will turn white and the plane will turn blue and sonic will be white with a black face. It doesn’t stop there watch all the credits and during the credits knuckles will be blue and sonic will be white with a black face and yellow eyes. at the end when the sonic three logo shows up it will still be sonic but instead of someone else driving the plane it will look just like super sonic its cool but it takes a while.

Enter the following codes on the special stage screen.
 
Level Code
2 2965 3192 9023
3 3610 2354 7327
4 2921 0274 3999
5 3737 7423 1487
6 3053 9029 9071
7 3698 8191 7375
8 3009 6111 4047
9 3482 7286 3167
10 2809 6267 2575
11 3454 5929 0879
12 2765 3348 7551
13 3582 0497 5039
14 2898 2104 2623
15 3543 1266 0927
16 2853 9185 7599
17 4014 2308 3455
18 3319 6540 9215
19 3964 5702 7519
20 3275 3622 4919
21 4092 0771 1679
22 3408 2377 9263
23 4053 1539 7567
24 3363 9449 4239
25 3837 0634 3359
26 3163 9615 2764
27 3808 8777 1068
28 3119 6696 7740
29 3936 3845 5228
30 3252 5452 2812
31 3897 4614 1116
32 3208 2533 7788
33 2994 5155 4236
34 3673 9888 9404
35 2944 5155 4236
36 3629 6970 4380
37 3072 0223 8396
38 3762 5728 9452
39 3033 0992 4284
40 3718 2807 4428
41 2817 0087 0076
42 3518 2963 2956
43 2788 8229 7788
44 3474 0044 7932
45 2916 3298 1948
46 3606 8800 3004
47 2877 4066 7836
48 3562 5881 7480
49 3348 5109 0364
50 4028 3236 9596
51 3298 8503 4428

Enter the following codes on the special stage screen.
Level
Code
1 3659 8960 3263
2 2965 3192 9023
3 3610 2354 7327
4 2921 0274 3999
5 3737 7423 1487
6 3053 9029 9071
7 3698 8191 7375
8 3009 6111 4047
9 3482 7286 3167
10 2809 6267 2575
11 3454 5929 0879
12 2765 3348 7551
13 3582 0497 5039
14 2898 2104 2623
15 3543 1266 0927
16 2853 9185 7599
17 4014 2308 3455
18 3319 6540 9215
19 3964 5702 7519
20 3275 3622 4919
21 4092 0771 1679
22 3408 2377 9263
23 4053 1539 7567
24 3363 9449 4239
25 3837 0634 3359
26 3163 9615 2764
27 3808 8777 1068
28 3119 6696 7740
29 3936 3845 5228
30 3252 5452 2812
31 3897 4614 1116
32 3208 2533 7788
33 2994 5155 4236
34 3673 9888 9404
35 2944 5155 4236
36 3629 6970 4380
37 3072 0223 8396
38 3762 5728 9452
39 3033 0992 4284
40 3718 2807 4428
41 2817 0087 0076
42 3518 2963 2956
43 2788 8229 7788
44 3474 0044 7932
45 2916 3298 1948
46 3606 8800 3004
47 2877 4066 7836
48 3562 5881 7480
49 3348 5109 0364
50 4028 3236 9596
51 3298 8503 4428
52 3984 0318 4572
53 3426 3571 8588
54 4116 9073 9644
55 3387 4340 4476
56 4072 6155 4620
57 3171 3435 0268
58 3829 6814 5852
59 3100 2081 0684
60 3785 3896 0828
61 3227 7149 4844
62 3918 2651 5900
63 3188 7918 0732
64 3873 9733 0876
65 5034 2855 6732
66 4339 7088 2492
67 4984 6250 0796
68 4295 4169 7468
69 5112 1318 4956
70 4428 2925 2540
71 5073 2087 0844
72 4384 0006 7516
73 4857 1181 6636
74 4184 0162 6044
75 4828 9324 4348
76 4139 7244 1020
77 4956 4392 8508
78 4272 5999 6092
79 4917 5161 4396
80 4228 3081 1068
81 5388 6203 6924
82 4694 0436 2684
83 5338 9598 0988
84 4649 7517 7660
85 5466 4666 5148
86 4782 6273 2732
87 5427 5435 1036
88 4738 3354 7708
89 5211 4529 6828
90 4538 3510 6237
91 5183 2672 4541
92 4494 0592 1213
93 5310 7740 8701
94 4626 9347 6285
95 5271 8509 4589
96 4582 6429 1261
97 4368 5656 3645
98 5048 3784 2877
99 4318 9050 7709
100 5004 0865 7853
101 4446 4119 1869
102 5136 9621 2925
103 4407 4887 7757
104 5092 6702 7901
105 4191 3982 3549
106 4892 6858 6429
107 4163 6858 6429
108 4848 3940 1405
109 4290 7193 5421
110 4981 2695 6477
111 4251 7962 1309
112 4936 9777 1453
113 4722 9004 3837
114 5402 7132 3069
115 4673 2398 7901
116 5358 4213 8045
117 4800 4767 2061
118 5491 2969 3117
119 4761 8235 7949
120 5447 0050 8093
121... 

To level select in this game, first you must pick any game file (has to be still be on level one) and with any character, go to the point where the swinging vines are, that are swining from left to right, hop on that. Next, the cheat, you press LEFT 3x, RIGHT 3x, and UP 3x, if done correctly, you would hear a sound as if you just collected a ring. Now, restart by pressing, Alt + R, and at the title screen, press up once or down twice to get to the Sound Test menu, enter there, and from there, you can pick any level in the game. But this only works for Sonic 3 & Knuckles, and Sonic 3. Have fun!