Final Fantasy X - Via Infinito

The Via Infinito is a secret bonus dungeon that can be accessed below the Calm Lands. It contains 100 cloisters each filled with enemies and strange puzzles that need to be solved in order to proceed deeper. A full enemy listing is as follows.
=== Floors 1-9 ===
* Sahagin
* Piranha 
* Dingo
* Condor
* Water Flan
* Garuda
* Ragora
* Killer Bee
* Dinonix
* Yellow Element 
* Sahagin Chief
=== Floors 10-19 ===
* Vouivre 
* Raldo
* Floating Eye
* Mi'ihen Fang
* White Element
* Bomb
* Dual Horn
* Ipiria 
* Thunder Flan
* Gandarewa 
* Raptor
* Lamashtu
* Red Element
* Funguar 
=== Floor 20 ===
* Dark Valefor and Dark Ifrit (boss)
=== Floors 21-28 ===
* Bite Bug
* Garm
* Simurgh
* Bunyip
* Snow Flan
* Basilisk 
* Ochu
* Aerouge
* Buer
* Melusine
* Gold Element 
* Kusariqqu 
* Larva
* Iron Giant
* Qactuar
=== Floors 29-34 ===
* Wasp
* Iguion 
* Murussu 
* Blue Element
* Xiphos
* Chimera
* Evil Eye
* Snow Wolf
* Mafdet
* Ice Flan
=== Floors 35-39 ===
* Zu
* Alcyone
* Sand Wolf
* Mushussu 
* Cactuar 
* Mech Guard
* Mech Gunner
* Sand Worm
* Sandragora 
* YKT-63
* YAT-99
* Phlegyas
* Remora 
* Octopus
=== Floor 40 ===
* Dark Ixion and Dark Shiva (boss)
=== Floors 41-49 ===
* Nebiros 
* Skoll
* Flame Flan
* Shred
* Mech Scouter
* Mech Hunter 
* Anacondaur
* Coeurl
* Ogre
* Chimera Brain
* Malboro 
* Defender 
=== Floors 50-59 ===
* Epaaj
* Imp
* Yowie
* Dark Element
* Nidhogg
* Thorn
* Valaha
* Ghost
* Tonberry
* Magic Urn
=== Floor 60 ===
* Dark Bahamut and Dark Yojimbo (boss)
=== Floors 61-68 ===
* Bandersnatch 
* Grat
* Grenade 
* Bashura 
* Ahriman
* Grendel 
* Mech Leader
* Mech Defender
* Dark Flan
* Behemoth
* Mandragora 
* Splasher
* Achelous
* Maelspike
* YAT-97
* YKT-11
=== Floors 69-79 ===
* Exoray
* Gemini
* Adamantoise
* Behemoth King
* Wraith
* Great Malboro 
* Barbotos 
* Demonolith 
* Varuna
* Defender Z
=== Floor 80 ===
* Dark Magus Sisters and Dark Anima (boss)
=== Floors 81-99 ===
* Land Worm
* Black Element
* Spirit
* Master Coeurl
* Puroboros
* Master Tonberry
* Mimic
* Ultima Weapon
* Omega Weapon
=== Floor 100 ===
* Nemesis (super boss)