The Cupcade does not come with games installed. However its really easy to install any kind of Arcade ROM by dragging it onto the SD card that comes with the kit. We'll show here how to install some of the free, non-commercial ROMs available from MAME.org
If you have other ROMs you'd like to play, just make sure they are "MAME roms" and not "NES roms" or "Sega roms". We suggest Googling for your favorite game and "mame rom"
If you're feeling like an archivist, archive.org has a 42 GIGABYTE collection of every MAME ROM they could find!
Before proceeding with your dry run, you'll want to have a game to play! There are a few free non-commercial ROMs available for testing your setup available. Visit the page at http://mamedev.org/roms/ and download the Robby Roto (horizontal video) or Super Tank (vertical video) ROMs.
Neither runs quite perfectly on the Cupcade (they use different screen resolutions) but are sufficient for testing the sound, buttons and joystick.
Now you have them, you can install the ROMs. Insert the cupcade SD card into any computer and browse the contents of the BOOT partition