Other is to be used for platforms which will have very, very few entries. Thus far only the Donner Model 30 analog computer, which was merely used to display videogaming was possible, with Tennis for Two, (See Wikipedia article: http://en.wikipedia.org/wiki/Tennis_for_Two)
Other can also be used when a (new) platform is missing. Do add Notes to Admin which platform you're talking about. In time (if this is a correct use) the admins can move the entries from Other to a newly created platform.