All the various tasks had different prizes, some were given out to the first correct answer, some were given out to randomly picked responses, and some were given out to everyone with the correct answer.
You may not consider it fair, but it's the best we can do. It's a contest hosted by the moderating team and as much as the contest times need to suit you, they need to suit us as well or there would be no contest in the first place.
As already pointed out previously, there will be ample opportunity for all interested players to participate and win in contests in the future. Thank you for all the feedback and enjoy the game till the next one.