Types of coins
This kind of coin just simply always rotates either clockwise or counterclockwise, making a linear time. This kind of coin will never rotate the other way and will always move at constant speed no matter what happens inside it.
This kind of coin has two time dimensions, and the wheel is split into two parts. One of the parts goes clockwise and the other goes counterclockwise. This causes time to go two different ways.
Depending on how many time dimensions a coin has, it will be split into different parts to make up for the different time dimensions.
The last type of coin is not linear and the wheel either doesn't move or moves randomly in either direction. This means time could go forward or backwards.
You can control the flow of time within a coin if you can rotate it in the direction you please. If you rotate it, it keeps the same speed as the other coins, so the speed of time is not changed when rotating, it is the same for every coin no matter which direction.