Wolfenstein 3D (DOS Player) allows you to play original DOS game on Android.

Wolfenstein 3D is an episodic first-person shooter and a follow-up to the top-down infiltration game Castle Wolfenstein. The game puts the player in the boots of B.J. Blazkowicz, an allied spy. In the first episode (Escape from Wolfenstein), B.J. is captured, but overpowers a guard with the help of a concealed knife and manages to get out of his cell.