Wonder Boy in Monster Land is the second game in the famous series of 2d platformers created by SEGA. Released originaly as an arcade in 1986, the game was ported to Master System in 1987 and many other platforms in the following years.
The game is a precursor of the 2D action/platformer role playing game. There are twelve levels, all very different, with towns, deserts, islands, different monsters, puzzles and unique items. Exploration is key, you will need to find treasures, potions, hourglasses (required to fill the Timer). You will get gold killing enemies, and you will be able to spend this gold to buy weapons (magic and normal ones) and other stuff.
Wonder Buy was very innovative as an arcade. The computer ports maybe were not so good, but they keep the atmosphere and playability. The graphics could have been better, but it's still an enjoyable game to try.