Within each class, Missions differ according to type: Common, Simple, Special, Important, Critical and Top Secret. Each type is marked with a corresponding color:

1. Common — gray
2. Simple — white
3. Special — green
4. Important — blue
5. Critical — purple
6. Top Secret — orange

The higher the Mission type, the more substantial the reward you get for its completion.

You can speed up Mission completion by tapping the “Boost” button.

When the indicated time runs out, you should tap the “Claim” button to receive your reward.