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This is a 1 loop clear of Galaga made by Namco and released in the Arcades in 1981.
In this gameplay video I clear the first 31 stages of the game and thereby completing a loop of the game. At this point the game difficulty has maxed out, which happens around stage 20, and we have also played all the bonus stages. This is what the community calls a Micro31.
From that point on the game just repeats itself and either goes to a killscreen or goes infinitely, depending on dipswitch settings.