Exile

Exile is a single-player action-adventure video game originally published for the BBC Micro and Acorn Electron in 1988 by Superior Software and later ported to the Commodore 64, Amiga, CD32 and Atari ST, all published by Audiogenic. The game was designed and programmed by Peter Irvin and Jeremy Smith. It is often cited as one of the earliest examples of a Metroidvania game and featured "realistic gravity, inertia and object mass years before players understood the concept of a physics engine... an astounding level of AI, stealth-based gameplay, a logical ecosystem governing the world's creatures and a teleportation mechanic that feels startlingly like a predecessor to Portal".