Gylt is an action game with a light horror theme and a strong emphasis on stealth. Players control Sally, a young girl who is bullied. She is looking for her cousin Emily who has been missing for weeks. Everyone has given up hope, but Sally keeps looking. The game starts as she is chased by some kids, but eventually she ends up in a fantasy world with some nasty creatures.
She can move around freely to explore and has to solve some puzzles along the way to progress. A map is always available with the current objective, important objects and the location of items such as batteries, canaries, diary pages, inhabitants, pictures, quartz etc. Inhalers restore health and soda cans can be used to distract enemies. Direct confrontation is encouraged and enemies have different alert states that influence their behavior. While sneaking around Sally can perform stealth kill as well, either as a flashlight jab or with a chokehold. It is also possible to fight back by shining light into the weak points of certain enemies. Batteries are needed to keep her flashlight working. Sally has a small amount of health and a stamina bar that prevents her from running all the time as it requires a short period to recharge.
Between gameplay sections the story is often furthered through comic-like cut-scene sequences with a hand drawn art style.