1CCBBH - 640. Sinistar (1 Loop Clear)
Not gonna lie, I've been meaning to do this one for a while now. But this is such a brutally mean game it was hard to find the motivation to do it again in an emulator without the 49-way joystick. I decided to attempt the RetroAchievements on this for my 150th arcade Mastery badge.
Now most everyone knows Sinistar - I'm sure people are already rushing to comment "I HUNGER" or "RUN COWARD" without even watching the video. But here's the thing about actually playing Sinistar - it's not the game's namesake that makes this so difficult. It's those friggin Warrior enemies. They will just zip around the screen with no rhyme or reason as to when or how many bullets they're going to fire, sometimes they'll hit you with a drive-by before you can even react. It's the true cause of what makes this such a ridiculously hard game.
Of course, as an arcade game released in the year 1983, there is no ending. For 1CC requirements, the most reasonable way to count it is doing a full "loop" of all 5 stages. The game starts on an unnamed first stage, then moves to the Worker Zone, then Warrior Zone, then Planetoid Zone, and then finally the Void Zone. Clearing the Void Zone (as shown here) will send you back to the Worker Zone, and any subsequent loops will continue in this manner. Except your credit probably won't last that long, because they keep increasing the amount of points you need for an extra life on default settings so it's pretty unsustainable. Those Warriors WILL get you.
This was not done in a branded "1CCBBH" stream but a general arcade RetroAchievements stream. I'll probably add a link to the VOD once it's uploaded here too. Unless I forgot to go back and edit this.