Heiankyo Alien

Developed in 1979 by the University of Tokyo's Theoretical Science Group, *Heiankyo Alien* is a pioneering fixed-screen action game that introduced the "trap 'em up" genre. Players control a Heian-period police officer tasked with defending the capital by digging pits in a maze to trap and bury invading aliens. Unlike many shooters of the era, the gameplay requires strategic planning and timing rather than direct conflict. Its unique mechanics and tactical depth made it a significant commercial success in Japanese arcades and paved the way for future classics.

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