VBA

VBA, short for VisualBoyAdvanced, is a gameboy emulator made for use with PC and Mac. This is a client that will allow you to play Gameboy GBA games, classics, such as Mario, Sonic or The Legend of Zelda. VBA is the client itself, but you will then need to download the ROM file (the game) for the Application to work.

Download VisualBoyAdvanced here:
Windows
Mac

Download your ROM files here:
ROM FILES

1) Download the ROM file and extract it if necessary.
2) Open up your client (in this case: VBA)
3) In the Application go to: "File/Open Rom/choose the ROM file." (Usually a .nds file)
4) Setup the controls and enjoy your game.