@fishmonkey,
If you put in the answer at 3 pm NST, there is a chance of being in the top 250 and getting the avatar. The conundrum was first posted on this forum at 4:10 pm, which is two hours ahead of NST, so the first posting was at 2:10 pm NST. Although there were several people that mentioned how easy they found it, I've found that if the answer isn't posted, the top 250 remains available for a while.