The Interstice Boundaries are a series of simple bonus dungeons added in Gensou Maroku W and accessed throughout the course of the main story. None of them have any boss fights or FOE encounters, but clearing each one presents a valuable reward not available in the original PC versions of the game. Keep in mind that the areas will only open up after accepting the rewards for their unlock quests from the incident board.

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Unlock Requirement: Defeat one of the Three Devil Daevas and recruit Satori as a shikigami

Chests:

• Area 1 - Bamboo Pole
  
• Area 2 - Royal Sovereign
  
• Area 3 - Pickling Weight, Master's Spear
  
• Area 4 - Mental Flayer Staff, Iron Ore
  
• Area 5 - Thorn Armor, Jeweled Sword, Steel
  
• Area 6 - Pretty Mirror

New Enemies:

• Arkhai Commander (☆)
  
• Red Skelton (☆)
  
• Hakusan Gongen (☆)

Touching the magic circle in Area 5 will grant the ability to convert inactive party members into shikigami from the party select menu. Reimu, Yukari, Byakuren, and Meiling can't be converted under any circumstances, and the four postgame characters can't be converted unless other requirements are met.

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Unlock Requirement: Touch the magic circle in Interstice Boundary 1 Area 5

Chests:

• Area 1 - Elemental Stone, Turtle God's Armor
  
• Area 2 - Mental Flayer Robe, Silver Ore
  
• Area 3 - Iron Ore, Fire Shard, Water Shard
  
• Area 4 - Carbuncle Staff, Silver Ore
  
• Area 5 - Thunder Shard, Elemental Stone
  
• Area 6 - Earth Shard

New Enemies:

• Lilith (☆)
  
• Shaina (☆) (♡)
  
• Neo Blob (☆)

Touching the magic circle in Area 5 will grant the ability to convert Satori from a shikigami into a party member from the party select menu.

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Unlock Requirement: Touch the magic circle in Interstice Boundary 2 Area 5 and defeat Kaguya & Eirin in Castle of Chaos Upper

Chests:

• Area 1 - Gold Nugget, Bisecting Nata
  
• Area 2 - Divine Spirit Stone, Magic Leather Armor
  
• Area 3 - Fantasy Stone, Trapezohedron
  
• Area 4 - Master's Armor, Drop of Mercury
  
• Area 6 - Dispel Robe

New Enemies:

• Grandchild of Otohime (☆)
  
• Vampire (☆)
  
• Virgin Moh Shuvuu
  
• Purgatory Hound (☆)

Touching the magic circle in Area 5 will grant the ability to convert Tenshi and Eirin from shikigami into party members from the party select menu.

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Map:


Unlock Requirement: Defeat Angra Menog at the Castle of Chaos Summit and finish the main story

Chests:

• Area 2 - Fire Crystal, Keystone
  
• Area 3 - Mysterious Bamboo, Lump of Iron, Thunder Crystal, Irminsul
  
• Area 4 - Earth Crystal
  
• Area 6 - Trapezohedron, Big Mirror
  
• Area 7 - Water Crystal, Damascus Steel
  
• Area 8 - Ultimate Yin-Yang Orb, Gold Nugget
  
• Area 9 - Dark Crystal, Light Crystal, Curse-Wielder's Hammer

New Enemies:

• Predator Dragon (☆)
  
• High Wizard (☆) (♡)
  
• Sugriva
  
• Golden Orc

Area 2, 3, and 9 block usage of the map. Area 2 loops horizontally. The north exit connects back to Area 1's south exit, and the south exit is a one-way path to the center of Area 3. Area 3 loops vertically and horizontally. The hole northeast of the starting point leads to Area 4's north exit, and the hole southeast of the starting point leads to Area 6's northeast exit. Area 9 loops horizontally. The hole in the southeast leads back to Area 8's northwest exit, and the southwest exit across the one-way hookshot point leads to Area 1's northeast exit.

Touching the magic circle in Area 5 will increase the level cap from 70 to 90. Just like with the Souzinengi V release of GoS, Gensou Maroku W rebalanced stats across the board, but it wasn't quite as drastic. The new level 70 seems to be about on par with the old level ~75-80, and the new level 90 is on par with the old level 99.