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If those methods don't work, try this. First you must have Sonic 2. Hook it up and put in the level select code, then put in the debug code and press START. When the screen with Sonic & Tails (Miles) pull out the game but DON'T turn it off and plug in Sonic 3. Now hold Up + A and press RESET.
When the main screen comes up press DOWN three times and you should see sound test go there hilight the level you want and hold A and press start. Now while playing press B turn into a sprite press A to change and C to paste it.
Alternatively, enter the Sound Test code and play sounds 2, 4, 5, 6 in order. If you did it correctly, the Emerald sound will play.
AA6T-AAXC Level select AWHA-CA92 Don't lose rings SCGT-DJYL Rings worth 2 SCGT-DNYL Rings worth 3 SCGT-DTYL Rings worth 4 SCGT-DYYL Rings worth 5 SCGT-D2YL Rings worth 6 SCGT-D6YL Rings worth 7 SCGT-DAYL Rings worth 8 KRGT-CAE0 75 Rings needed for a free guy GLGT-CAE0 50 Rings needed for a free guy D4GT-CAE0 30 Rings needed for a free guy CWGT-CAE0 20 Rings needed for a free guy BLGT-CAE0 10 Rings needed for a free guy HCGT-DJZY Get 2 free guys for 100 rings instead of 1 HCGT-DNZY Get 3 free guys for 100 rings HCGT-DTZY Get 4 free guys for 100 rings HCGT-DYZY Get 5 free guys for 100 rings HCGT-D2ZY Get 6 free guys for 100 rings HCGT-D6ZY Get 7 free guys for 100 rings HCGT-DAZY Get 8 free guys for 100 rings AC5A-CAHN Super ring powerup worth 0 A05A-CAHN Super ring powerup worth 5 instead of 10 B85A-CAHN Super ring powerup worth 15 CW5A-CAHN Super ring powerup worth 20 DG5A-CAHN Super ring powerup worth 25 D45A-CAHN Super ring powerup worth 30 GL5A-CAHN Super ring powerup worth 50 NW5A-CAHN Super ring powerup worth 100 (1-Up every time) AJZA-CA8N Super Sonic doesn't lose rings AJ3A-CA7A Infinite lives AG4T-AAH4 Start with 1 life AL4T-AAH4 Start with 2 lives A04T-AAH4 Start with 5 lives BL4T-AAH4 Start with 10 lives DG4T-AAH4 Start with 25 lives GL4T-AAH4 Start with 50 lives NR4T-AAH4 Start with 99 lives ACAT-CAB6 Shield can be activated multiple times AJRT-CA8R Invincibility power-ups last forever 986A-CAB6 Invincibility lasts almost twice as long KR6A-CAB6 Invincibility lasts half as long E06A-CAB6 Invincibility lasts 1/4 as long SCFT-BJT4 Only need 6 chaos emeralds SCFT-BNT4 Only need 4 chaos emeralds SCFT-BTT4 Only need 3 chaos emeralds SCFT-B2T4 Only need 2 chaos emeralds SCGA-BL0N + A4GA-A28T Blue spheres worth 2 SCGA-BR0N + A4GA-A28T Blue spheres worth 3 SCGA-BW0N + A4GA-A28T Blue spheres worth 4 SCGA-B00N + A4GA-A28T Blue spheres worth 5 SCGA-B40N + A4GA-A28T Blue spheres worth 6 SCGA-B80N + A4GA-A28T Blue spheres worth 7 SCGA-BC0N + A4GA-A28T Blue spheres worth 8 ACGA-AA8T 1 Blue sphere needed for chaos emerald TAYA-CRB6 Bonus jump AAYA-CWB6 Super jump AAYA-C0B6 Mega-jump ATST-CA38 Never drown (must switch off for some spring-pad jumps)
Note: You might notice a few levels you haven't seen before, but you can't select them. Those levels were originally intended for the game, but were pulled in order to release the game on time.
Enter the Sound Test menu and choose any zone. Hold A and press Start. You should be Tails and be in debug mode. From here press B, then press A until you see a box. Press C to select it, then press B to return to Tails.
To enable Super Tails, jump on the box. Tails will look weird and can not be hurt or lose any rings. He can still get squashed and drowned, though, so be careful in the Ice Cap zone. You will have do this at the beginning of each zone. Robotnik can hurt him at the very end of Launch Base zone-act 2.