• Hidden Arsenal is a new booster pack series that brings you cards from the Duel Terminal arcade machine series, previously available only in Japan.
• This set includes cards from the OCG Duel Terminal 1. It's the first series of Hidden Arsenal. It is followed by Hidden Arsenal 2.
• Introduces the "Ice Barrier", "Mist Valley" and "Worm" archetypes to the TCG as well as further support for the "Ally of Justice", "Neos", "Kuriboh", "Cyber Dragon", "Flamvell" and "X-Saber" cards.

• English Set Name: Hidden Arsenal
• Korean Set Name: 숨겨진 세력
• OCG Set Prefix: HA01
• OCG Release Date: May 25, 2010
• Cover Card: Brionac, Dragon of the Ice Barrier
• 5 cards per pack, 30 packs per box
• Includes 30 cards:
  • 15 Secret Rares (1:1)
  • 15 Super Rares (4:1)

OCG Set Card Ratios
Korean

OCG Set Card Galleries
1st Edition
Korean

Unlimited Edition
Korean

OCG Set Card Lists
Korean

• English Set Name: Hidden Arsenal
• French Set Name: Arsenal Mystérieux
• German Set Name: Hidden Arsenal
• Italian Set Name: Arsenale Nascosto
• Spanish Set Name: Arsenal Secreto
• TCG Set Prefix: HA01
• TCG Release Date:
  • November 5, 2009 (Europe)
  • November 10, 2009 (North America)
• Cover Card: Brionac, Dragon of the Ice Barrier
• Features:
  • Each pack contains 5 Limited Edition foil cards: 1 Secret Rare and 4 Super Rares.
  • Each card is marked as Limited Edition and possesses Gold Security Foil.
• 5 cards per pack, 36 packs per box
• Includes 30 cards:
  • 15 Secret Rares (1:1)
  • 15 Super Rares (4:1)

TCG Set Card Ratios
TCG

TCG Set Card Galleries
Limited Edition
English - French - German - Italian - Spanish

TCG Set Card Galleries
Unlimited Edition
English

TCG Set Card Lists
English - French - German - Italian - Spanish

• HA01-EN001 Blizzed, Defender of the Ice Barrier (Secret Rare)
• HA01-EN002 Blizzard Warrior (Super Rare)
• HA01-EN003 Cryomancer of the Ice Barrier (Secret Rare)
• HA01-EN004 Mist Valley Thunderbird (Secret Rare)
• HA01-EN005 Mist Valley Shaman (Secret Rare)
• HA01-EN006 Mist Valley Soldier (Secret Rare)
• HA01-EN007 Flamvell Dragnov (Super Rare)
• HA01-EN008 Flamvell Magician (Super Rare)
• HA01-EN009 Flamvell Guard (Super Rare)
• HA01-EN010 X-Saber Axel (Super Rare)
• HA01-EN011 X-Saber Airbellum (Secret Rare)
• HA01-EN012 X-Saber Uruz (Super Rare)
• HA01-EN013 Commander Gottoms, Swordmaster (Secret Rare)
• HA01-EN014 Ally of Justice Clausolas (Super Rare)
• HA01-EN015 Ally of Justice Garadholg (Super Rare)
• HA01-EN016 Ally of Justice Rudra (Super Rare)
• HA01-EN017 Worm Apocalypse (Super Rare)
• HA01-EN018 Worm Barses (Super Rare)
• HA01-EN019 Worm Cartaros (Super Rare)
• HA01-EN020 Worm Dimikles (Super Rare)
• HA01-EN021 Worm Erokin (Secret Rare)
• HA01-EN022 Brionac, Dragon of the Ice Barrier (Secret Rare)
• HA01-EN023 Mist Wurm (Secret Rare)
• HA01-EN024 Flamvell Uruquizas (Secret Rare)
• HA01-EN025 X-Saber Urbellum (Secret Rare)
• HA01-EN026 Ally of Justice Catastor (Secret Rare)
• HA01-EN027 Wrath of Neos (Secret Rare)
• HA01-EN028 Detonate (Super Rare)
• HA01-EN029 Berserker Crush (Super Rare)
• HA01-EN030 Evolution Burst (Secret Rare)