Groups (1)

Card groups are curated collections of cards organized by card type, monster type, guardian star alignment, fusion targets, duelist decks and drops, equip synergies, merge levels, and more. You can select one or more groups to build a custom card pool — every card from the selected groups is combined into a single pool that you can then use in duels, fusion simulator (fusion playground), merges, and more.

Each group has a name and a list of cards (some with quantities). When you select multiple groups, cards that appear in more than one group are counted multiple times — useful for building probability-weighted pools in POOL mode.

Card groups are used across multiple tools and game modes throughout the site:

• Groups page — browse, select, and combine groups to build your card pool before heading into a duel or simulator
• Card Overview — filter the full card list by group to quickly find specific collections
• Duel (Free Duel / Custom Duel) — choose which card groups form your deck before dueling any opponent
• Fusion Simulator — filter available cards by group to narrow down fusion possibilities
• Free Merge — select which card groups appear in the merge interface
• Merge Levels — each merge level range (e.g., levels 1-5, 6-10, etc.) has its own pre-defined card group
• Passwords — filter card passwords by group for quick reference
• Initial Deck — filter cards by group when setting up your starting deck

Groups are organized into several categories, each serving a different purpose:

Fusion Groups

Cards needed to fuse specific high-value fusion monsters like Twin-Headed Thunder Dragon (2800 ATK), Summoned Skull (2500 ATK), or Mystical Sand (2100 ATK). These show you exactly which cards to farm or collect to build towards a target fusion.

Specific Fusion Groups

Fusion recipes for named monsters with fixed ingredient combinations — Meteor B. Dragon, B. Skull Dragon, Gaia the Dragon Champion, and others. Some have deterministic 4-card recipes (e.g., Meteor B. Dragon requires Dragon + B. Meteor Dragon), while others include multiple valid ingredient combinations and can contain dozens of cards.

Monster Type Groups

Cards grouped by monster type — Dragon, Spellcaster, Warrior, Fiend, Zombie, Beast, Machine, Fairy, and more. Useful when you need monsters of a specific type for fusion recipes or deck building.

Card Type Groups

Cards grouped by card type — Monster, Equip, Magic, Trap, Ritual, and Field. Each group contains every card of that game category, making it easy to filter by card type across the site.

Guardian Star Groups

Cards organized by their guardian star alignment (Sun, Mercury, Venus, Moon, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto). Guardian stars determine fusion outcomes in Forbidden Memories — knowing them is key to mastering the fusion system.

Duelist Decks & Drops

Complete 2048-card decks for every duelist in the game, plus their drop tables organized by rank pool (S/A POW, S/A TEC, B/C/D). Use these to study what cards each duelist plays and which cards they can drop.

Equip Groups

Cards that work well with specific equip cards like Legendary Sword, Dark Energy, or Malevolent Nuzzler. Each equip group shows which monsters gain the most from that equip card.

(STB) Spell-Trap Base Groups

Specific monster cards that serve as fusion bases to create Spell and Trap cards through the game's fusion system. Each group is centered around a key monster — Monster Tamer, Kairyu Shin, Dragon Zombie, and others — showing which cards can fuse into them as a base for spell/trap fusion.

Fusion Recipes (Equips, Magic, Rituals, Traps)

The exact ingredient cards needed to fuse specific equip, magic, ritual, and trap cards through the game's fusion system.

Merge Level Groups

Cards available at each merge level range (1-5, 6-10, 11-15, 16-20, 21-25, 26-30). These correspond to the game's merge system where higher levels unlock stronger cards.

Spreadsheet Groups (SS)

Groups based on a well-known community spreadsheet for understanding fusions. These classify cards into categories like Animal, Aqua, Dragon, Fiend, Spellcaster, Warrior, Female, Shadow, Neptune, etc. — a classification that experienced players use to memorize fusion patterns by mixing groups together as a memorization strategy.

Glitch Groups

Known glitch fusions and glitch-related card combinations from the original game, including the Baby Dragon Glitch Fusion and various others.

Special & Curated Pools

Curated selections like Strongest, Weakness, Defensive, Highest Fusion, Default Group, Passwordless (cards obtainable without passwords), and others for quick access to commonly used card sets.

You can create your own custom groups by clicking the + button, give it a name, and start adding cards by searching or browsing the full card list.

Custom groups are saved in your browser's local storage and work exactly like built-in groups — they appear in group selectors across the site (duels, simulator, merge, Card Overview, etc.). You can edit, rename, or delete them at any time.

The Groups page has a toggle between POOL mode and DECK mode that changes how cards are handled:

• POOL mode — each card's quantity represents its probability weight in the pool. A card appearing 10 times across selected groups has 10x the chance of being selected compared to a card appearing once. The card pool shows total cards and unique cards separately.
• DECK mode — all cards are treated as actual deck copies. The system tracks how many copies of each card you have (max 3 per card with the limit x3 option) and shows an 'Exceeding Limit' counter when you go over 3 copies. This mode simulates building a real deck within the game's 3-copy limit.

The 'limit x3' option enforces the game's rule of maximum 3 copies per card. When enabled, any card exceeding 3 copies is flagged as 'Exceeding Limit' — this helps you build legal decks that respect Forbidden Memories' card limit restrictions.

In DECK mode, it enforces the 3-copy deck limit — cards exceeding 3 copies are filtered out and flagged as 'Exceeding Limit'. In POOL mode, it caps each card to at most 3 copies in the resulting deck — a card that appears 10 times in the pool still has higher probability of being drawn, but can only appear up to 3 times in the final selection.

Yes! Use the Export/Import buttons on the Groups page to share your custom groups. You can export groups as a JSON string, share it with someone else, and they can import it using the Import button. This is useful for sharing optimized card pools, challenge decks, or curated collections with the community.