You’ll need the base ROM. This should be a The Goonies 2 ROM.
Head on over to Generate Randomized Game and provide your ROM. The next screen will show a variety of game options.
First, you’ll need something to run your newly minted game on. We recommend using an emulator. An emulator is a program that closely replicates NES hardware, allowing you to run NES games on your computer. You can get the recommended emulator, FCEUX, at their website here.
There are other supported ways to play, including on original NES hardware.
You’re finally ready to go! The best way to learn is to load up your new ROM and start playing.