HAL21

Released by SNK in March 1985, HAL21 is a vertically scrolling shooting game where players control two ships: the player-one vessel "CLAIN" and the player-two vessel "HAL," utilizing both anti-air and anti-ground weaponry to battle. While the core gameplay follows the lineage of Xevious—a title that held significant influence at the time—it incorporates a unique system that allows players to restart from the spot where they were defeated. Another defining feature of the game is its power-up mechanic, which grants 20 seconds of invincibility and a powerful shot after collecting five "E" panels placed on the ground.

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