Check out this video from InTheLittleWood on how to find the 15 creative coins that will be in the featured maps. This is also a part of completing the overtime challenge to win a free battle pass for next season. Also, a hint that if you have collected some coins and could not collect all of them in time then leave the match and join back and you can try to get the coins from beginning. Don’t forget to start the game with supporting the creator and within a featured map. Once more important point that I saw is if you have collected all the coins but could see that they are reflecting for you then go to overtime challenge window and you can find all that you have collected are stored.