Sonic the Hedgehog - Cheats (Control Mode, Level Select, Debug Mode)
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Source: https://www.ign.com/wikis/gen-cheats/Sonic_the_Hedgehog_1991_Cheats#Control_Mode
Control Mode
At the title screen, press Up, C, Down, C, Left, C, Right. While playing, you can pause the game and use A to restart, B for slow motion, and C for frame advance.
Level Select
At the title screen, hold A then press Up, Down, Left, Right. When you hear the chime, press Start. If that doesn't work, try this: at the title screen, press Up, Down, Left, Right, hold A, and press Start. After doing this once, you only need to hold Start + A to enter the level select.
Debug Mode
Enable Control Mode. After pressing Start to begin a game, hold A until you see Sonic. If you see a bunch of hex numbers on the top of the screen, you're in Debug Mode.
To start debugging, press B, then you can select any sprite in that level and put it on the screen. To select a different sprite, press A, and to place it on the screen, press C. Note that sprite selection is different from Zone to Zone. Also, instead of displaying the time elapsed, it displays the number of sprites currently on the screen. Control Mode functions work as well.
Note: This only works on the first production releases of Sonic.
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