The Raiden Project features two vertically scrolling arcade shooters on one disc: Raiden and Raiden II. Raiden takes place in 2090, a time when Earth is under attack by hordes of alien "exobiological beings, a race of technologically advanced creatures from a distant galaxy." To combat this threat, the world's top scientists, engineers and otherwise brilliant people have replicated a super high-altitude fighter/bomber from the remains of a downed alien vessel. This new ship is called Raiden (aka Lightning Thunderbolt), and you are its pilot.
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Really good ports but Raiden I and II themselves are kind of drab and sauceless. Probably the best way to play both, or at least was until arcade emulation maybe. II definitely is my preferred of the two, besides the extremely funny laser it's basically the same thing slightly improved on. II has kind of ass music though, I'm not sure if the original did but I didn't really actively notice it there.