Technical Implementation
Due to technical limitations the game world scrolls by shifting 8x8 "blocks" rather than individual pixels. Similar techniques are used in e.g. Zeliard, Cosmo's Cosmic Adventure and Duke Nukem II. Console and arcade platform games would typically perform this using dedicated hardware, such as the PPU in the NES which can scroll the background.
The graphics borrowed heavily from other games, such as Turrican and the MS-DOS version of Mega Man.
Read more about this topic: Duke Nukem (1991 video game)
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“Where there is the necessary technical skill to move mountains, there is no need for the faith that moves mountains.”
—Eric Hoffer (1902–1983)