Sonic the Hedgehog 2/Cheats

Level Select
go on Sound Test heres are the codes : 19, 65, 09, 17 to unlock the level select in the title screen if you unlock it hold A and press START.

Debug Mode
01, 09, 09, 02, 01, 01, 02, 04 to unlock it!

All Chaos Emeralds
04, 01, 02, 06 to unlock it!