Play the Game as one player until the end. Time Starts when selecting the Normal Mode. Time ends when kicking the Endboss in Level 100 when he is captured in a bubble (he flies out of the screen). Secret Door Appears only when you play until Level 50 without dying Version.
This is the original rule. But in my knowledge and in most of the game play videos in youtube, it seems like there is no screen that can choose between normal game and super game. So i searched from https://gamefaqs.gamespot.com/arcade/583720-bubble-bobble/cheats this page. it says you need super mode cheat code to open the screen which is seen in berlindude's run. I want to know if he used this kind of code and whether i need to use this cheat code or not to run the category.
(Actually i heard some things from the 2 runner who did 2 players any% recently and after that mod changed the rules. BUT honestly, i think it needs to be changed not to use cheat code or hidden code instead of "Secret Door Appears only when you play until Level 50 without dying Version". This might can confuse some new runners and it can cause to use other cheat codes like power up code or some other thing.)