A device used to decode a Coded Box. When used, a random weapon in both the Top 50 and Top 30 list can be obtained for permanent or with a period of 7, 30 or 100 days. 15 Mileage Points will be awarded upon use.
- South Korea: 29 December 2016.
- Taiwan/Hong Kong: 3 January 2017
- China: 4 January 2017
- Japan: 18 January 2017
- Indonesia/CSN:Z: 8 February 2017
These weapons are the "special guests" that only appeared during their first release and removed two weeks afterward. The weapons return after 6 months of its initial release and available permanently afterwards except for later premium weapons which are only re-added 1.5 years after initial release. Some weapons are never re-added and only available through special sale events. Some of these weapons are also added to Mileage Auction.
- Unique Grade
- Transcendent Grade
- South Korea
- 29 December 2016: Firstly introduced.
- 19 January 2017: Added Red Dragon Cannon, Special Duck Foot Gun, Sterling Bayonet (3 weeks)
- 2 March 2017: Added Brick Piece S1451 (3 weeks)
- 20 April 2017: Added Python Desperado (Premium, 1 month)
- 1 June 2017: Added Bunker Buster LTD (1 month)
- 29 June 2017: Added AUG Guardian (Premium, 1 month)
- 27 July 2017: Readded Red Dragon Cannon (2 weeks)
- 10 August 2017: Added Pesticide Sprayer (1 month)
- 16 August 2017: Rearrange the contents (Replaced Lightning AR-1 and Crossbow with Special Duck Foot Gun and Sterling Bayonet)
- 7 September 2017: Added Bouncer (1 month)
- 21 September 2017: Added Dual Sword Phantom Slayer (Premium, readded Python Desperado, 1 month)
- 19 October 2017: Added Stun Rifle (1 month, replaced Brick Piece M777 with Brick Piece S1451)
- 16 November 2017: Added Star Chaser SR (1 month)
- 18 January 2018: Added Magnum Lancer (2 months)
- 8 March 2018: Added Arm Torch (1 month, replaced SKULL-9 with Bunker Buster LTD)
- 22 March 2018: Added Claymore Mine MDS (1 month)
- 19 April 2018: Added Dual Beretta Gunslinger (Premium, readded Dual Sword Phantom Slayer, 1 month)
- 3 May 2018: Rearrange contents (Replaced Crowbar Maverick, VULCANUS-9, and FG-Launcher with Red Dragon Cannon, Bouncer, and Pesticide Sprayer)
- 23 August 2018: Rearrange contents (Star Chaser SR is added to Top7, Bouncer is descended to Top25 and M950 to Top50 while THANATOS-7 is removed.)
- 13 September 2018: Added back Python Desperado to Top 50 Decoder and held two fold probability event.
- 20 September 2018: Added Python Desperado to Top 7, descended SG552 Lycanthrope to Top 25 and Black Dragon Cannon to Top 50.
- 1 November 2018: Added Stun Rifle and Arm Torch to Top 7, descended Blood Dripper and Gáe Bolg to Top 25, Savery and Volcano to Top 50, and removed THANATOS-5 and BALROG-XI.
- 10 January 2019: Added Hellfire Sword for 2 weeks.
- 21 February 2019:
- 22 August 2019:
- Added M249 Phoenix, Hunter Killer X-12, and Hunter Killer X-90 to Top 7.
- Demoted Blade Runebreaker, Magnum Drill and Arm Torch to Top 25.
- Added Hunter Killer X-45, Hunter Killer X-7, Hunter Killer X-15, Star Chaser AR, Milkor M32 MGL and Claymore Mine MDS to Top 25.
- Demoted Bouncer, Bunker Buster LTD, Brick Piece S1451, Pesticide Sprayer, Stun Rifle, SKULL-9, Crossbow Advance and Thunderbolt to Top 50
- Removed THANATOS-7, THANATOS-9, M950 Attack, Sterling Bayonet, OICW, Flame Jackhammer, Tornado, War Fan and Special Duck Foot Gun
- 9 May 2018: Added Red Dragon Cannon, Blade Runebreaker, Bunker Buster LTD. Removed Ethereal, Brick Piece V2, Dart Pistol.
- 10 October 2018: Added Compound Bow and Laser Minigun. Removed Sapientia and Brick Piece M777.
- 30 January 2019: Added Python Desperado, Bouncer, Star Chaser SR, Star Chaser AR, Brick Piece S1451, Arm Torch, Pesticide Sprayer. Removed Batista, Lightning AR-1, FG-Launcher, VULCANUS-9, Petrol Boomer, Aeolis, Destroyer.
- 20 February 2019: Replaced Star Chaser AR with Stun Rifle.
- 16 May 2019: Added AUG Guardian and Star Chaser AR. Removed Blaster and Stun Rifle.
- 4 September 2018: Added M249 Phoenix, Hunter Killer Series, Claymore Mine MDS, M32 MGL Venom. Removed Rail Cannon, Compound Bow, SKULL-9, Bendita, OICW, Crossbow Advance, Crowbar Maverick, Coil Machine Gun.
- 2 October 2019: Re-added Rail Cannon, Compound Bow, SKULL-9, Bendita, Crossbow Advance, and Stun Rifle. Removed THANATOS-5, THANATOS-7, THANATOS-9, Attack M950, Brick Piece T50 and Crossbow.