If you manage to shoot all enemies in a level you reach the next level of Galaga and don't exit to the main game (Tekken). There are 8 levels. In
case you don't get a level perfect you just have to press SELECT as soon as your levelstats (shootdown) are shown. Then you can replay the level. If
you do this in level 8 you are back in level 1 though. This is really mean, but Galaga is mean already...
Hold ^ (triangle) for rapid fire.
While the PSX boots up and the Sony logo is shown hold the following key combo on the second controller until Galaga starts and you already see
the second ship:
UP, L1, ^, X
There is another possibility to get the second ship, but this is a lot harder. You just have to finish a level perfect in under 18.5 seconds. This
is doable but very hard, just as Galaga.
You can unlock the Devil Kazuya constume with Galaga. But this is really really hard. At first you have to make it perfect (100% shootdown) through all
8 stages of Galaga. Then you are not allowed to use the code mentioned above here for the second ship. If you need the second ship you have to earn it
the hard way. And you also are only allowed to use select for a continue just once.
Well, damned, this is hard. And that's why there are the flight patterns of the enemies in Galaga below here. Remember them good! Hopefully this is helpful for you.