Some idea for game design

At the start point of the game, the game player will be given an amount of bill for using during the game journey. As we know, car will cost more energy and produce more pollution to the environment. However, public transport will cost twice less than the private car and walking cost the least. During this game, you can choose your transport tool from several types of transportation tools supported. If the transportation tool you choose cost more energy, the more money you will lose. On the contrast, the less energy you use, the less money you will lose.

At the same time, if you drive car as your transport tool, you will prepare more money and time to spend during your game journey such as car parking fees and looking for car parking place. You will lose your game if you make the choice of costing too much of your money.