Curious Light

Curious Light is the yellow half of the pair of guides, and the wiki entry for it uses the names Starlight and Yellow Light, one of The Three Architects. Where Moonlight shows up to help on the main floors, Curious Light appears in almost every floor and above all after you die in a subfloor: a four-pointed star at the top of your screen, glowing yellow in a black room surrounded by water.

What its help looks like

It gives tips about the entities of the subfloors, but they are vague and often state the obvious or nothing useful. In The Rooms and The Archives it mostly lights up areas of progression, such as exit doors and certain items. In The Backdoor it is more concrete: its dialogue says it placed the levers that keep you from dying to Haste, and it makes shimmering sounds near room keys. After you finish The Backdoor, it brings you back to The Reception through a yellow doorframe. In the Hotel and Mines it also appears as a Rift.

Details

It has its own quiet, somber soundtrack, a muted version of Moonlight's. Its symbol, a white or yellow four-point star, is also on the Starlight Vial, Bottle and Jug and on the Stardust icon. In SUPER HARD MODE!!! entering The Rooms sends you to a different Roblox game. It is also one of six entities with dialogue.