Fanatastic Gauntlet Clone. Instead of a fantasy swords and sorcey theme, we are instead plunged into World War II.
Played this on the ZX Spectrum. Two difficulty modes where you must infiltrate an evil Nazi castle, rescue 3 prisoners, then blow all levels of the castle to smithereens. Wolfenstein was to come later of course in 3D, but it's 8 Bit games like this that set the firm foundations. Great stuff! ~ njenkin