Mini Moto Speed Race is a fun racing game where you will need to avoid various hazards while trying to take down many rival racers. If you get close to another cyclist you will hit them, which is appropriate since they are your competition and you are looking to knock them out, which will give you extra money.
Also you can collect them from courses and you will get power ups whenever they appear. As soon as you have enough diamonds, you will be able to buy more weapons and bikes from the shop. Make sure to avoid the numerous obstacles and pitfalls you come across, as they will cause you to fall and lose, which is something you definitely don't want to happen.