Sigil

Overview
Sigil is a Yume Nikki fangame created by Anoghastra. It was made for Dream Diary Jam 2 in Game Maker: Studio.

Gameplay
Sigil is a non-traditional fangame. The goal of the game is to reach the lowest level of the player character's subconscious. Each level has 1-3 doors with a node puzzle that requires you to create a sigil in order to unlock and progress to the next area. The level map will change each time you sleep.

There are also a number of NPCs in each area, one of which who'll provide the code for the door when you try to unlock at least once (the other NPCs will provide hints on the code-giving NPCs location). Some doors will lead you to dead-ends, from which you'll have to wake up and try again.

Plot
Not much is known about the game's plot. You explore the dreams of the unnamed protagonist.