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Before the title screen comes on, press Up, Up, Down, Down, Up, Up, Up, Up. It's hard do do since you have to do it so fast to beat the title screen appearing. You will also be able to hear music from the levels in Sonic & Knuckles from the Sonic 3 level select sound test menu. |
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From the level select screen, select an act but hold A and press start when you choose it. Debug commands are same as in Sonic 1 & 2. |