Simplify the following text for a Grade 10 native English-speaking person.
Original: MapleStory is a free-of-charge ( with pay-to-play elements ) , 2D , side-scrolling massively multiplayer online role-playing game developed by the South Korean company Wizet . Several versions of the game are available for specific countries or regions , and each is published by various companies such as Wizet and Nexon .
Simplified: MapleStory is an online computer game made by the Korean company Wizet , and maintained and distributed by Nexon .