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The Shelter Gates Puzzle is in Parasite Eve II, located in the Upper Sewer and Reservoir after defeating the Glutton.

Note that the Flood Gate is mandatory to progress, while the Full Moon Gate is optional to perform a side-quest in Dryfield. In addition, if the player skips on the Full Moon Gate (at first) and return to Dryfield later, they will miss out on the side-quest: This is the only chance the player will have (at this point in the game) to perform this.

Flood Gate

Aya/Kyle by the Flood Gate control.

In the Reservoir, a memo on a wall can be found:

Check for occupants before opening [Flood Gate].
Let the rats, roaches, and spiders drown, but first...
Count their legs, enter the total, and raise the lever.

A rat has 4 legs, a roach has 6, and a spider has 8. The answer is 18.

Nearby is a control panel. Set the 'tens' to 1 and the 'ones' to 8 to drain the reservoir and flood the sewer, opening a new path.

  • If the player does this while the Bog Diver is still alive, it will neutralize the creature's threat level, allowing Aya to pick it off, casually.

Full Moon Gate

Full Moon Gate clue.

Full Moon Gate control panel.

This puzzle can be traced back to the Dilapidated House at night. If Aya looks out the window, some important flavor text will appear.

The moon's out.
Full moon tonight.
A friend told me they call this the "15th night" in Japan.
The night of the full moon is supposed to be good luck."

Later on in the Upper Sewer, Aya will find a panel on one side of the room and a memo on a wall at the other:

"[Full Moon Gate] - open only after midnight."
"Enter age of the fullest moon and raise the lever."
There's something written in Japanese. If only I could read it...

The answer is 15. At the control panel. Set the 'tens' to 1 and the 'ones' to 5 to unlock a nearby gate.

Note that the Full Moon Gate is NOT by the memo. If you want to get the True Ending, go back up the ladder and through the gates at the east end which is the real Full Moon gate. If you do not want to receive the best ending, go through the "EXIT" door, return to B3 and take the elevator back up to B2.

As a heads up, should the player wish to see the best ending, they should find Pierce at the Water Tower and rescue him by defeating the three Mind Sucklers that are attacking (Flint is not required for this segment, but if he is alive, he will lead you to him).

v · e · d
Characters
Aya Brea - Eve Brea - Kyle Madigan
Rupert Broderick - Eric Baldwin - Gary Douglas - Flint - Pierce Carradine - No. 9 GOLEM - Jodie Bouquet
Neo-Mitochondrial Creatures
Bass - Bat - Black Beetle - Worms (Caterpillar, Maggot) - Amoeba (Green Amoeba, Red Amoeba) - Moth - Rat - Scorpion
Artificial Neo-Mitochondrial Creatures
Stranger (Grinning Stranger, Boss Stranger, Odd Stranger, Lesser Stranger, Creeping Stranger, Horned Stranger) - Stalker (Zebra Stalker, Gray Stalker, Ivory Stalker, Skull Stalker) - Suckler (Blood Suckler, Bone Suckler, Mind Suckler, Sucklerceph) - Scavenger - Chaser (Desert Chaser, Blizzard Chaser, Mad Chaser) - Fatties (Brute, Mossback, Slouch) - Diver (Bog Diver, Sea Diver) - Stinger (Brain Stinger, Puppet Stinger) - GOLEM (Pawn GOLEM, Rook GOLEM, Knight GOLEM, Bishop GOLEM)
Machines
Watcher - Derangement Speaker
Unique Neo-Mitochondrial Creatures
Boss Stranger - No. 9 GOLEM - Gray Stalker - Burner - Blizzard Chaser - Ivory Stalker - Glutton - Generator (Proto Generator, Beta Generator) - Sea Diver - Puppet Stinger - Brahman - Eve
Locations
Abandoned Mine - Akropolis Tower - Dryfield - M.I.S.T. Headquarters ( Shooting gallery ) - Neo Ark - Shelter
Archives
Ammunition - Armor - Bounty Points - Items - Gameplay - Modes - Rankings - Shops - Soundtrack - Weapons
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