How to get alternate levels with out cheats.
Playing in Retroarch Steam with cheats on. Turned on mega jump which caused the level transition to loop. During the looping i noticed that the back ground changed on the pipe warp screen. So i turned off the cheat and let it transition normally. I got the regular level. So i did it again and got an alternate world of 1-2 and other underground levels.
So how do you activate the alternate version of world 1-2 and other underground levels with out cheats? I don’t mean the a, b, c and d levels.