Watch SM's real 1 Credit Clear run on SEGA's arcade shooter 1993 Alien 3: The Gun. Yes, a 1CC is indeed possible.

Alien 3: The Gun is loosely based on the film series, but in this you shoot lots of aliens that just want to jump on you.
The cabinet uses big machine-gun controllers, which move a cursor around like similar games from this time. The gameplay area is displayed in a wide screen aspect ratio, however the game is outputted in 4:3.

The strength of your shot seems to get weaker at 75%, and every 25% after, so it is best to do a quick release/hold of the trigger before 75%.
You pick up bombs, and get 2 more if you continue, these can be used to clear the screen, be used as a panic bomb attack, or can be used to clear scenery to score more points. I use most of mine for the points.
Other powerups are a flamethrower shot, this isn't very useful apart from clearing the scenery on the first stage, health items that recover 25% health. Rescuing the prisoners also awards health.

Scoring is simple, apart from there being no way to see your score until you clear a stage or run out of health. It seems to be 20k for most enemies, awarded once the enemies are completely taken out, if they survive and go off the screen, they score 0. Scenery awards 10/20k. From calculating the scoring in my runs, I work out that 20.6M is the maximum realistically possible score on a 1CC run.
At the end of every stage, it displays a rank, this seems to be factored on when you stop certain attacks from hitting you.

The best strategy is to learn where all the enemies attack from, and have the cursor ready for them, if you take out some face-huggers early, then you don't have to deal with it jumping on you a few seconds after.

However most of the bosses are difficult! I made a guide:
1st boss has a difficult attack, when it walks around the front. A way to stop this attack is to only start shooting as it leaps, but it is still hard to stop. The other strategy is to let it attack you and it to jump back, as you can usually do more damage once it has jumped. It does 12% damage on every attack, so you can take 2 hits and still get back to 100% at the start of Stage 2-1.

2-1 boss is the hardest boss. It has destructible parts which flash, and leave very little room for error. The second form fires missiles that give a lot of damage, they award no points. The third form consists of the parts that were not destroyed in the first form, the room for error is similar to the first form, however the boss is moving around a lot and is very hard to clear without getting hit.

2-2 boss is more manageable. You have to use a bomb where I do, or you will take damage, following this part, you then have to make the boss lose health twice or you get hit by the alien's tail, the timing of the bomb before will impact on if you get hit here or not. The safest way is to just bomb again once it has approached you. Also if you bomb twice, you don't risk getting hit at the end, like I do in this run. That attack is guaranteed too, unless if you beat the boss before it. I don't use two bombs so then I can use them for scoring. You can recover any damage back on Stage 3.

3 boss isn't much of a challenge, it fires a projectile, and then two more. However after this, you have to damage the boss 3 times before it attacks, so it is best to take down the second set of projectiles and then aim for the boss. Though with doing this you run the risk of getting hit by the projectiles, which I do in this run. It is safe to take damage here as you will recover at least 100% health in Stage 4.

4 boss is simple, just keep your cursor on the boss and release/pull the trigger every couple of seconds. There is no way at all to stop taking 20% damage at the end of the first form. Don't bother trying to bomb it.

5 boss strategy is similar to the Stage 4 boss, but you have much less room for error, failing to shoot the boss for a quarter of a second and you will take damage. I feel this boss is a bit too difficult, but at least you get a lot of bombs before it, but it is best to save some for the Stage 6 boss.

6 boss is just stupid, if he rolls all the way to the left side of the screen after the first attack, you have to bomb or you will take a lot of damage, this happens in this run.
If you have 4-5 bombs, just bomb your way through the boss. However for scoring purposes, using a bomb reduces your score from the boss, of a maximum of 615k if you can resist using bombs. If you bomb all the time, you can get as low as 350k.
After this, if he stays on the left side of the screen, you have to bomb again, or you will take the same level of damage. This also applies to if he rolls to the right side and stays on the right side, but this happens far less. The most often patterns is the left roll, or the slow walk to the right.

00:00 - Intro
00:30 - Stage 1
03:39 - Stage 2-1
08:03 - Stage 2-2
12:19 - Stage 3
15:30 - Stage 4
19:59 - Stage 5
22:44 - Stage 6
24:23 - Ending

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