ZSNES is a SNES games emulator for PC (also known as the Super Nintendo emulator or Super Nintendo Entertainment System) that runs on Microsoft Windows, DOS, Linux, FreeBSD, MAC OS X (x86) and Microsoft Xbox (unofficial). It is a free software that helps you to play classic games that were running on the old Super Nintendo (SNES) game console (a 16-bit video game console that was very popular and was sold in nearly 50 million copies worldwide). It has a lot of features (e.g. speed options, fast-forward function, image upscaling, multiplayer gameplay using a TCP/IP network, use of cheats, save states support, movie recording etc.) that are best described in ZSNES Documentation ( available as a HTML or TXT file) found in "docs" folder (after you extract the content of ZSNES archive). To be able to play older games that were available on ROM cartridge you need ROMs or ROM images with them. Obviously, due to legal issues, ZSNES does not provide such files and in most countries, it is illegal to create copies of such games.