In the Washington Trail App, you will need to purchase supplies and survive traveling down the trail. You purchase supplies in a town, then when you leave you must have enough supplies and health to get you through to the next town.
At the start of each of the four legs, you will have the chance to buy supplies (food, medicine, blanket, tent). You also start out with a new set of money each time, your health resets, and your supplies reset so each leg is its own puzzle.
While on the trail, food decreases, health decreases if you eat too little or move too quickly, and you lose or gain supplies through deterministic events.
You die if your supplies run negative of your health is 0.
At any time you can change your rations (amount of food you eat) or pace (how quickly you gain distance).