Before last week, the last time I’d played “The Oregon Trail,” I was staring at a green-screened Apple II in an elementary school computer lab. I believe George Bush the Elder still held office. As it turns out, the game has soldiered on through several versions over the years. While more action-oriented gamers were busy turning interdimensional baddies into puddles of goo, families of pioneers have continuously set out from Missouri on months-long, dangerous treks to the West Coast.