Lost in the darkened halls of the heavenly palace. You cannot see the enemy, and they cannot see you -
Your only torch is your gun.
For one instant each shot gilds the whole palace - eaves, cloud sea, and the shadows facing you - then the world goes dark again.
Enemies make sounds: close your eyes and listen - left ear or right? Louder means closer.
Ammo is plentiful: 45-round magazine, R to reload. Survive wave after wave - deeper waves bring more, faster shadows.