What it is
The referral code is a code used to invite people in Battle Camp and spread the community. Each player has their own unique referral code. A referral code will look like an alphanumeric code.
Only one referral code can be used.
Where you can use it
The Battle camp does not have a proper section to enter the relevant code, it appears only once in the beginning at level 4.
If you have not reached level 4, after defeating four frostbites it will ask for a code.
What it does
The referrer player will get a puzzle part of a monster while the referred player will get an Ultimate Monster Spin.
How to see your referral code
You can view yours by going in Player > Options > View my referral code.