This game is fire. Metal Gear 1 was more simplistic, while this game is basically Metal Gear Solid in 2D. Great story, which isn't common for older games, fun gameplay with cool little details and unexpected uses for items, and the soundtrack slaps, especially the intro theme. It's a shame it wasn't released worldwide untill MGS3 came out.

If you emulate the original MSX version, use the Turbo-R mode and patched ROM with Turbo Fix. Otherwise the game will run either too slow or too fast.