[Updated 12/20] Please note that the previously announced rewards for December 21 and December 29 have been updated so as not to have an unintended impact on the game economy.

Requirement: One character per account, level 30 or above; level 110 or above for Zero to open Hot Day boxes

Accept each day's special box or other items through the gift box icon on the left side of your game window, then double click the box in your inventory to open it.
Limit one package per account.
You'll need to relog to see the gift box icon if you're already logged in at midnight, or if you level up to meet the level restriction.

December 21

Reward:
RED T-Shirt Coupon (30 day): Untradeable. Gives a permanent RED T-shirt which can cover your regular top. It cannot be moved to your Cash inventory or deposited in the Clothes Collector in Henesys Market.
RED Paint Bucket Coupon (30 day): Untradeable. Gives a permanent RED Paint Bucket which can cover weapons. It cannot be moved to your Cash inventory or deposited in the Clothes Collector in Henesys Market.
RED Coins (10)
Special Potential Scroll (1 day): Untradeable. 100% chance to give potentials to regular equipment.
Defiance Special Bit Box (3): Untradeable. Each box contains a random 1 of the 6 Defiance Special Bits. Available for use until 2/1/2014.

December 22

Reward: 1 Hot Day box, containing:
Chaos Scroll 100% (9 day): Untradeable. Alters equipment for better or worse.
RED Pet Equipment Exclusive Scroll 60% (7 day): Untradeable. 60% chance to increase Weapon/Magic ATT +2.
Miu Miu the Merchant Coupon (30 day): Untradeable. Use to receive 5x Miu Miu the Traveling Merchant.
Inventory 8 Slot Coupon (7 day): Untradeable. Receive a random coupon that will expand one section of your item inventory by 8 slots if you 8 or more less than max slots.
Commander's Chair : Untradeable. Permanent. Recovers 100 HP and 50 MP every 10 seconds.
RED Coins (30)
Separate from the box:
Rhinne's Protection: Untradeable. A permanent, decorative effect which can be toggled on or off. It cannot be moved to your Cash inventory.

December 25

Reward: 1 Hot Day box, containing:
Rudolph's Red Nose (7 Day): Untradeable, Required Level: 10, Category: Face Accessory, STR/DEX/INT/LUK: +2, Weapon/Magic Attack: +2, Upgrades Available: 5
Christmas Cheer (7 Day): One of a Kind, Untradeable, Required Level: 10, Category: Medal, STR/DEX/INT/LUK: +5, Max HP/MP: +200, Weapon/Magic Attack: +5, Weapon/Magic DEF: +200, Accuracy/Avoidability: +100, Speed/Jump: +10
Mystical Butterflies Permanent Coupon (7 Day): Untradeable
Golden Nose Bandage 100% (7 Day): Untradeable. 100% chance to increase Weapon/Magic ATT +2 on Rudolph's Red Nose.

December 28

Reward: 1 Hot Day box, containing:
Revolution Pendant: Untradeable, Required Level: 80, Category: Pendant, STR/DEX/INT/LUK: +5, Weapon/Magic DEF: +90, Upgrades Available: 4
Clean Slate Scroll 20% (7 day): Untradeable. 20% chance to restore 1 previously lost upgrade slot.
RED Armor Enhancement Scroll 50% (7 day): Untradeable. 50% chance to increase Weapon/Magic ATT +1.
Evolution Pendant Scroll 30% (7 day): Untradeable. 30% chance to increase Weapon/Magic ATT +1 on a Revolution Pendant.
Profession Coupon (7 day): Untradeable. Raises 1 Profession at Level 9 or below to the next level.
Red Sand Mount Coupon: Untradeable. Permanent. Weapon/Magic DEF +10. Red Sand Cloud mount skill enables you to Glide.
RED Coins (20)

December 29

Reward:
Revolution Belt: Untradeable, Required Level: 80, Category: Belt, STR/DEX/INT/LUK: +3, Weapon/Magic DEF: +50, Upgrades Available: 4
Gold Awakening Stamp (7 day): Untradeable. 80% chance to add 1 additional line of Potential to a piece of equipment with 2 or fewer Potentials.
Evolution Belt Scroll 30% (7 day): Untradeable. 30% chance to increase Weapon/Magic ATT +1 on a Revolution Belt.
Trait Boost Potion (7 day): Untradeable. Randomly increases Ambition, Empathy, Insight, Willpower, Diligence, or Charm.
RED Coins (20)
Zero Mystery Capsule (7 day): Only usable on Zero. Moveable within the account. Adds a certain amount of Weapon points when used.
Evolution Storm Growth Potion (10 day): Moveable within the account. Gain a level when used on character at Level 180 or below.
Revolution Lucky Item Scroll (10 day): Only usable on Zero. Moveable within the account. 100% chance to permanently changes Zero's weapon to be part of the Revolution set.
Defiance Special Bit Box (3): Untradeable. Each box contains a random 1 of the 6 Defiance Special Bits. Available for use until 2/1/2014.
Special Potential Scroll (1 day): Untradeable. 100% chance to give potentials to regular equipment.