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[Treewyrm]

Yup... DOS, Windows and even Linux versions LOL, I have em all and proud of it. Awesome shmup, there is only one that is better: Tyrian. But Tyrian is almost impossible to surpass I bet. :-)

the_fifth_horseman, I remember those things were used to access some easter eggs, the game is full of em. Also some combinations do really modify gameplay a bit, although I don't remember which ones do what anymore, I used to play it long ago. Perhaps a good time to replay it again.

Also I would suggest to try Demonstar SM1/SM2, made by the same people behind Raptor, essentially it's a superb clone of Raiden. Unfortunately it doesn't have shop and other distinguishable features seen in Raptor and Tyrian. On the other hand network coop is extremely fun. :-)