Contract Level
The Exclusive Contract (EC) is a time limited reward system. The goal is to increase your Contract Level, which will unlock rewards. For each Contract Level you increase, a reward will be unlocked. Your Contract Level will increase after collecting 400 Contract EXP. Contract EXP can be collected through completing daily missions or can be bought with diamonds. Daily missions are refreshed every day. Each time you use diamonds to buy Contract EXP, the price will increase and it will not be reset during the EC.

Rewards
Rewards can be collected as soon as you have reached a certain Contract Level. Any unlocked rewards that are not collected during the EC, can be collected after the EC has ended.

Basic Tasks vs. Premium Tasks
All players start with the Basic Tasks in each new EC. Basic Tasks will give you 1 reward for each Contract Level increase. By unlocking Premium Tasks, you will receive 1 additional reward for each Contract Level increase. Premium Tasks are only active for the current EC and will expire after the EC has ended. In each new EC, the Premium Tasks need to be unlocked again.