Similar to 2013's Christmas event, mice can collect presents in vanilla maps, but they are used for other purposes.
Last year, mice could trade gifts and unwrap them. Red gifts are scattered around vanilla maps. If you collect 10 red gifts, you will be rewarded with one Green Gift or one Blue Gift, once you use them.
If you are given a Blue Gift, you will get a Gold Gift
If you are given a Green Gift, you will get a Pink Gift.
If you trade Green Gift with a Blue Gift, the mouse who offered a Green Gift will get a Pink Gift, and the mouse who offered a Blue Gift will get a Golden Gift.