Special monsters
Some monsters are only unlocked in Grandpa's store if you have met specific criteria. For example, the Sinister Serpent is only available for purchase once you have obtained 50 Water-type monsters.
Rare Cards
Win the game to get these cards at random.
Note: You only get 3 cards below each time you beat the game so you may need to beat it multiple times to get all the cards in the game.
| Unlockable: | How to Unlock: |
| Dungeon Worm | Beat the game once (random). |
| Fortress Whale | Beat the game once (random). |
| Giltia the Dark Knight | Beat the game once (random). |
| Javelin Beetle | Beat the game once (random). |
| Red Eyes Black Dragon | Beat the game once (random). |
| Rigras Leever | Beat the game once (random). |
| Sanga of Thunder | Beat the game once (random). |
| Super War Lion | Beat the game once (random). |
Misc. Unlockables
This can only be unlock by doing certain tasks in the game. They can all be bought at Grandpas' Shop in Entrance Hall.
| Unlockable: | How to Unlock: |
| Celtic Guardian | You must surrender 20+ times in Area 3 and 4 |
| Crow Goblin | You must have less than 10 wind monsters after Area 1 |
| Firewing Pegasus | After 10+ hours of play and in Area 2 |
| Sinister Serpent | Have 50+ water monsters |
Monster Evolutions
Unlockable Monster Evolutions:
| Unlockable: | How to Unlock: |
| Dark Witch | Place a Level 4 LaMoon in a square with 50 light |
| Fireyarou | Level Flame Manipulator to Level 3 |
| Great Moth | Place a Level 3 Larvae Moth in a Square that has 30 Wood |
| High Tide Gyojin | Place a Level 6 Root Water in a Square that has 50 Water |
| Hunter Spider | Level Kumootoku to Level 4 |
| Hysoube | Place a Level 6 Psychic kappa in a Square that has 50 Water |
| Larvae Moth | Place a Level 3 Petit Moth in a Square that has 30 Wood |
| Magician of Black Caos | Place a Level 4 Dark Magician in a Square with 40 Dark |
| Manga Ryu-Ran | Level Ryu-Ran to Level 2 |
| Mon-Larvas | Level Larvas up to Level 4 |
| Penguin Knight | Place a Level 3 Penguin Soldier in a Square that has 40 Water |
| Perfectly Ultimate Great Moth | Place a Level 4 Great Moth in a Square that has 40 Wood |
| Red-Eyes Black Metal Dragon | Place a Level 4 Red-Eyes Black Dragon in a square with 60 Dark |
| Rock Spirit | Place a Level 5 Haniwa in a Square that has 40 Earth |
| Ryu-Kishin Powered | Level Ryu-Kishin up to Level 5 |
| Shining FriendShip | Level Petit Angel up to Level 5 |
| Trent | Level Anchient Tree of Enlightenment to Level 3 |
| Tripwire Beast | Level Electric Lizard to Level 6 |
Fusions
Unlockable Fusions:
| Unlockable: | How to Unlock: |
| Blue Eyes Ultimate Dragon | 3 Blue eyes white dragons at level 2 |
| Cyber Saurus | Blast Juggler lv. 5 & Two-Headed King Rex Lv.4 |
| Darkfire Dragon | Firegrass & Petit Dragon lv. 5 |
| Flame Swordsman | Flame Manipulator & Masaki the Legendary Swordsman at lv. 4 |
| Flying Penguin | Penguin Soldier & Penguin Knight lv. 2 |
| Gaia the Dragon Champion | Fuse Gaia the Fierce Knight and Curse of Dragon lv. 3 |
| Gate Guardian | Sanga, Suijin, and Kazejin at lv.3 |
| Harpie Lady Sisters | 3 Harpie Ladies Lv. 3 |
| Kaminari Attack | Ocubeam & Mega Thundeball at lv. 5 |
| Kwagar Hercules | Hercules Beetle & Kuwagata ALpha lv. 3 |
| Metal Dragon | Lesser Dragon lv.3 & Steel Ogre Grotto #1 lv.3 |
| Metal Zoa | Zoa lv. 2 & steel scorpion lv. 3 |
| Millennium Golem | Destroyer Golem & The Statue of Easter Island at lv. 5 |
| Rabid Horseman | Battle Ox & Mystic Horseman at level 3 |
| Summoned Lord Exodia | R. & L. arms, R & L legs and exodia the forbidden one all at lv. 2 |
| Thousand Dragon | Time Wizard lv. 3 & Baby Dragon lv. 5 |
| Twin-Headed Thunder Dragon | 2 Thunder dragons at lv. 4 |
More experience points for monsters
To get more experience for a monster, have that monster destroy your opponent's symbol. They will get anywhere between 50 to 100 experience points.
Start each round with all your monsters
Usually when a monster or capsule is destroyed, you cannot use it during the next round. However, if you start the next round and bring up the menu with "End Turn", "Unit List", etc. and go to "Surrender" and select "Try Again", you will restart the level with all your monsters available for use.
Map advantages
Certain map attributes can cause physical damage to your monsters, such as lakes of lava and crackling electrical arcs. Only monsters with the same attributes as these dangerous spaces can pass through unharmed.
Harpie Lady Sisters
You must have three Harpie Ladies in order to fuse the Harpie Lady Sisters monster. Because only two Harpie Ladies are available for capture on Mai Valentine's Valley of Howling Winds board (and never in the shop), you must play through the game twice to get all three.
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