You’ll need the base ROM. This should be a The Goonies 2 ROM.
crc32: aa9ca482
md5: d38325cffb9ba2e6f57897c0e9564cc0
sha1: 0a5b8fd5e46f56203f8bf12e888f4f2ea1616aa8
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. We recommend the FCEUX emulator, find out more at the FCEUX website.
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.