nagradni

1. prize
   Učestvovala sam u nagradnoj igri na Instagramu. — I took part in a giveaway on Instagram.
   Nagradni fond ove godine je veći. — The prize fund is bigger this year.
2. reward; given as a reward
   Najbolji radnici dobili su nagradno putovanje. — The best workers got a reward trip.
   Za svaku kupovinu dobijate nagradne bodove. — You get reward points for every purchase.

Very common collocation: nagradna igra — a giveaway or prize contest.