When a challenge creator invites you to judge, you'll get a notification with an accept/decline option. Accepting gives you access to that challenge's Judging tab, where you'll see every submission alongside the criteria you're scoring against — nothing else about your account or other challenges is affected.
If a challenge is running calibration rounds before live judging opens, you may be asked to score a small shared set of sample submissions first — this checks that judges are interpreting the criteria consistently before real scores start counting.
