Jewel

The Purple Jewel in Catacomb Abyss.

Rare and precious, Jewels (sometimes called Gems) are useful items in the Catacomb Adventure Series that upgrade the Crystal Sphere. Each one covers the denizens of different areas, and will give you their position on the Sphere if they get in range. Without the Jewel, those associated enemies will not show up on the Crystal Sphere at all, so finding them can be extremely helpful.

In almost every game in the series, there are multiple gems of every color hidden away, so if a player misses one in an earlier level, there is a chance to get it again later.

In Catacomb Abyss

In Catacomb Abyss, the Jewels are pretty evenly scattered through the early levels, resulting in the player being able to collect the entire set by Level 8. Without the Jewels, the Crystal Sphere will still detect Bats and Nemesis.

Purple Jewel

Detects: Zombies

• Found in a storeroom in The Towne Cemetery, behind a door requiring a Red Key.

Yellow Jewel

Detects: Skeleton Warriors

• Found in a storeroom in The Mausoleum Grounds, behind a door requiring a Yellow Key.

Red Jewel

Detects: Mages, Evil Eyes, Red Demons.

• Found in a storeroom in The Main Floor of the Mausoleum, in the Place of Enchanted Cubes. Destroy a cube to find it.

Blue Jewel

Detects: Water Trolls, Blue Demons.

• Found in The Ancient Aqueduct.

Green Jewel

Detects: Green Trolls, Orcs.

• Found in The Orc Mines.

In Catacomb Armageddon

In Catacomb Armageddon, the Jewels are found very early on, so the player has all of them by Level 6. Without the Jewels, the Crystal Sphere will still detect Bats and Nemesis.

If the player misses any, every single Jewel appears in The Chamber of the Evil Eye.

Purple Jewel

Detects: Zombies.

• Found in the Hidden Storeroom in The Towne of Morbidity, next to a Blue Key.

Yellow Jewel

Detects: Treants, Skeleton Warriors, Killer Rabbits.

• Found in The Dark Forest, right before the end of the level.

Red Jewel

Detects: Giant Ants, Mages, Evil Eyes, Two-Headed Demons.

• Found in The Garden of Forgotten Souls, behind a breakable wall directly in front of the starting point.

Green Jewel

Detects: Vipers, Wretched Poxes.

• Found in The Lost City of the Damned, in the Hall of Bones, behind a breakable wall.

Blue Jewel

Detects: Succubi, Sea Serpents.

• Found in The Demon Hold, at the level exit.

In Catacomb Apocalypse

Unusually, in Catacomb Apocalypse, the Green and Yellow Jewels are hidden in the first two levels, and then all of them can be found in the 4th level. Without the Jewels, the Crystal Sphere will still detect Devil Rays and Nemesis.

Green Jewel

Detects: Wizards, Fishmen

• Found in The Sanctuary of the Dead, behind a hidden wall in the Wizard's Garden.

Yellow Jewel

Detects: Death Squads, Spectres, Robot Ants, Golden Trolls, Time Lords

• Found in The Wizard's Garden, inside the hidden temple after a huge number of Robot Ants.

Red Jewel

Detects: Cyborg Demons, Time Lords, Walking Tanks, Invisible Horrors

• Found in The Axis of the Time Lords, in the Keep of the Mystic Gems.

Purple Jewel

Detects: Sentry Eyes

• Found in The Axis of the Time Lords, in the Keep of the Mystic Gems.

Blue Jewel

Detects: Android Mages, Blue Demons, Cyber Poxes

• Found in The Axis of the Time Lords, in the Keep of the Mystic Gems.