Giftsplosion 2011

Giftsplosion 2011 was the Christmas gift giving event of 2011. Over the course of 23 days, the Roblox administrators released 13 gift boxes into the avatar shop. Gifts were rewarded to those who met the requirements hidden within the riddles provided. Once an obtaining period has ended, the gift box was put on sale with a timer for a set amount of Robux based around the difficulty of the requirement. After the gift box went off sale, it opened and granted the owners a new item in their inventory.

More information about this Giftsplosion can be found in this blog post.