They implemented the basics of the game in those two weeks, including purchasing supplies, making choices at specific points of the journey, and the hunting minigame. They also included the random events happening to the player, and Heinemann had the idea to make the random events tied to the geography of the trail, so that cold weather events would be more likely in the mountains and attacks more likely in the plains.[6] They also added small randomization of outcomes such as the amount of food gained from hunting; they expected that in order for the children to be interested in playing the game multiple times there needed to be variations between plays.[5] Prior to the start of Rawitsch's history unit, Heinemann and Dillenberger let some students at their school play it to test; the students were enthusiastic about the game, staying late at school to play. The other teachers were not as interested, but did recommend changes to the game, particularly removing negative depictions of Native Americans as they were based more on Western movies and television than history, and could be problematic towards the several students with Native American ancestry at the schools.[6][8]