Dragon Quest 2 is a RPG developed by Chunsoft and published by Square Enix in 1987 as a part of the Dragon Quest series. The Android version is available on Google Play several days ago, priced at $4.99.
Dragon Quest II is set 100 years after the events of the first game. The game's story centers on the prince of Midenhall, who is ordered to stop an evil wizard named Hargon after Hargon destroys Moonbrooke Castle. On his adventure, he is accompanied by his two cousins; the prince of Cannock and the princess of Moonbrooke. Dragon Quest II greatly expands on the series formula from the first game by having a larger party, more areas to explore, multiple heroes and enemies in a battle, and a sailing ship.
The sequel improves on the gameplay of the original by allowing the player to control individual members of the adventuring party, not just the primary hero. In what would eventually become a staple of the genre, you can also engage multiple enemies at once. The story takes place in the same universe as the original game, unlike the Final Fantasy series, but events start 100 years later in the lore. The original game map from Dragon Quest is included in the story.
The NES graphics from the original game have been spruced up a bit for the Android release, and the interface is (oddly) designed to be played vertically. Players now can download it for free to have a try: http://bit.ly/1uQv2uk