You will find the following items in the menu options in Maplestory:
Mini Map: You can minimize or maximize your Mini Map or bring the World Map up on the screen. This will also tell you the current location you are in.
Key Setting: This will pop-up button to set the menu, you can change the keyboard options.
Quick Slot: This will bring up a Quick Slot screen which will allow you to select the skills you want to place on your hot keys.
Cash Shop: The Cash Shop is a place where you can buy clothes, hair salon coupons, accessories, messenger items, pets and other items.
Menu: This will bring up a selection screen where you can find the following options:
Change Channel: Use this to go another channel.
Game Option: This will change the different game options.
System Options: This will change the system options of the game(Maplestory powerleveling).
Quit Game: You will exit the game and return to the main MapleStory menu.