gistfile1.js

// load the `gameState` param from localStorage and convert it from JSON to an object
var game = JSON.parse(localStorage.getItem("gameState"));
// after the above line, you can type `game` in your console to see what properties it has

// change the `game.stores.wood` param to 15
game.stores.wood = 15;

// re-encode the game state into json and update localStorage
localStorage.setItem("gameState", JSON.stringify(game));

// reload the current window
window.location.reload();