Super Secret Password???

[Adeno]

Spoiler below!

It seems that the code is assembled from where you got them in this order:
middle ending - bad ending - good ending
(I don't wanna spoil stuff but if you finished the game 3 times, you'll know which ending is which.)

An easy way to "finish" the game 3 times is by finishing it once, then after the ending credits, simply go choose Load and choose the latest save. It should be obvious which one it is as it tells the location for the final scenario. You just have to do different things to get specific endings

--edit by mod.
really, you don't think that was quite a bit of spoilers?