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If I buy the battle pass late can I still do week 1 challenges?
Sure can! The challenges unlock each week then remain available until the end of the season. Unlock it week 5? You immediately have 5 weeks of challenges.
Have fun!
Does it work that way for the tiers too? If I buy the Battle Pass week 5, and I already have tier 15 for the free BP, do I immediately get tier 15 for Season 3 as well?
Yup, and you'd instantly get all the rewards in that situational as well!