Tips and Tricks
Coins are scattered throughout each stage, either singled out or in groups. Collecting them is key to keeping your run going, as they'll give you a small boost upwards but not as high as some power-ups
Adventures are essentially goals you have to meet in order to earn rewards, including coin bonuses and multipliers.
You can buy a Coin Doubler for $4.99,and both Gems and Coins can be bought through an in-app purchase.