Some pure-hardware multicarts were fabricated in/for the Brazilian market by VLS (aka Intelligame) as a pirate competitor to official releases by Digiplay in that country. This is defined as a "multicartridge" because the games were never intended to be packaged together and are generally unrelated.
Source Links:
web.archive.org/web/20190616225600/www.intellivisionworld.com/English/News/2006_11.html