I remember it for Pokemon, but also for those Zelda games that were a pair - Oracle of Ages/Seasons? But I don’t think it let you do much, just continue a game save when you finished one of the two games.
Well, with that memory unlocked, it’s time to go pull out my Dune II CD and fire that one up again. House Ordos! In the meantime, I guess I’ll check out BAR.