Game & Watch
The Game & Watch series is a series of self-contained handheld games that are the precursor to the Game Boy.
There are no "Game & Watch ROMs"; each Game & Watch game is a self-contained unit that is custom-built to each game. However, there are different ways to play the games in a virtual matter.
- Nintendo officially released virtual reproductions in the games and compiled them in the Game & Watch Gallery (and, later, Game & Watch Collection) series of games. These games had both "classic" and "modern" variations of these games. While thses collections have a loss of "authenticity" (especially in the collections that are running on earlier hardware), these collections are Game Boy, Game Boy Color, Game Boy Advance, and DS games for which emulators are widespread. (A few games are from the difficult-to-pirate DSiWare series, though every game in the DSiWare series appears in another collection.)
- Pica Pic (by Hipopotam) is an online collection of Game & Watch games under an authentic presentation. While there seems to be no way to play these games offline, there are a few games that are exclusive to the website, one example being Nu, pogodi!
- Madrigal wrote some simulations that give an offline, authentic presentation of the Game & Watch games, the collection of these games growing through time. Of particular note is that these simulations are available to play through RetroArch through the gw-libretro core.