There are 5 Tiers in Motocrossnitro. Each tier has 3 races. Each race is a different type, for example: Tier 1, race 1 is a sprint type, this is the casual "complete before your oppenents" in a normal, typical track. All the different types of races are:
Tier 1 Edit
In this race you are required to complete a dirt track before your oppenents. You have to go through going through mud, hills, and dangerous drops to complete this track. This race is a sprint race as shown in the picture. A sprint consists of not worrying about anything else but being first. It is a simple start to finish race. Do some tricks to get you nitro is a bonus but the objective is to come first. There are three challenges that will earn you extra money when you complete them. These challenges are on every track you play. However, if you exit from the race, you will not acheive the award or the challenge completion.