challenges can be spammed

[Qekker]

People can spam challenges. So they complete the same challenge 100 times in a row

[Muspah]

Can you give me a little bit more context? Are they spamming the chat with complete messages, or what is happening exactly? What is the output of /usb version and do you have a server logfile?

[Qekker]

They can skip the cooldown on the challenges.

[fjeddy]

It took me a while to understand how the configuration works. At first I thought like you, that you could only do an achievement once within the cooldown period, but when you add the + deliminator to a challenge rewards, then the challenge can be completed an endless amount of time.

requiredItems:
        - APPLE:2;+1

When this is the requirements, then you need 2 apples to complete it the first time, the second time you need three apples, the third time you need 4 apples. Every time you complete the achievement, you need one extra Apple to complete it one more time. But, when the cooldown period is over, you reset the apples required back to 2 then + 1 for every round.

Hence, the cooldown doesn't decide how often a challenge can be completed, it defines and decides when the requirements needed to complete should be reset.

Note I agree that this bit can be a bit confusing, and at first, I thought it worked like you, that the cooldown defined how often a challenge could be completed, not when the requirements reset.