There is a mushroom spawner at the start (Weird stone stick). Hit it to spawn mushrooms, farm coins for 3 minutes and buy food. With the amount of content, that's enough to get through the whole game quickly.
Don't be ridiculous. If you have a pc and internet connection available to you, there is a really high chance that you have access to credit cards in your country.
Yellow one looks like a later model Renault 5 presumably a GT Turbo (not to be mixed with a normal Turbo which is a rally car) and the orange one looks like a modern 911 Porsche.
