Deep Down's allegedly infinite dungeon generator will vary depending on "emotion".
Apparently there will "great numbers" of emotions, and dungeons will vary depending on which ones it represents.
As an example, angry dungeons might be full of fire, while sad dungeons will be icy.
The dungeon's emotions will affect how it can be won, and the mementoes - residual thoughts - found within will be depend on emotion, too.
The Tokyo Game Show Deep Down demonstrations were of joy dungeons, apparently; the light in them represents hope.
Deep Down is starting to sound pretty amazing. It's a free-to-play PS4 exclusive, and Capcom claims its dungeon generator is capable of infinite variation. The story is some mad sci fi thing about futuristic time travellers, and it supports solo and multiplayer. It looks very Dark Souls, and its built on Capcom's lovely new Panta Rhei engine.