Having problems getting all of the characters in Crossy Road? It may sometimes seem like there are not enough coins in the game. Here's a simple yet effective trick which can rack you up hundreds of extra coins per day. The trick involves the use of the in-game advertisements, so you must be connected to the internet. In normal gameplay every so often after you die, you have the opportunity to watch an advertisement for 20 coins (or 40 coins with the piggy bank.) With this trick, it will allow you to constantly see the advertisements. First, double click your device and remove Crossy Roads from your background applications by flicking it up. Then start the game again. Once you die, you should be prompted with the advertisement option. Once the advertisement is over and you have received your coins, double click out of the app again and close it. The next time you start the game, you should have the option to watch an advertisement again. If this trick stops working after a while, here is the reason why (quoted from crossyroad.com)
WHY HAVE THE ADS STOPPED WORKING?
Firstly, make sure you are connected to the internet. If you have been playing the game and watching ads for a while, but they have stopped showing, then you may have reached your daily maximum set by the Ad networks. Please wait 24 hours.
You will still be able to gain a few hundred extra coins per day, but you will not be able to earn thousands at a time. If you are having trouble with this method, I would advise clicking the link at the top of this guide to see the step-by-step video version.