To be more specific and to provide examples of how it would work, let’s assume that the initial task is reaching level 50 in a certain game. Upon reaching that level, you are rewarded with a certain amount of JMPT. That is the whole task.
Now, in the Games module, this task would be split into different sections with different levels of completion. Instead of it being one big task for you to reach the 50th level, it could be spread out into multiple different sections. That is, for example, you would receive a certain reward upon reaching level 10, then another reward for reaching level 25, and finally, the last reward upon reaching level 50.