Awakening: The Dreamless Castle is a game involving puzzles with hidden-object elements. Players are tasked to search for clues that will help in solving different types of puzzles. The player gets to control the character of Sophia, a girl who has been sleeping for the past hundred years. After waking up, the player has to solve puzzles in order to learn about what happened to her. The player is guided by a fairy along the way. The fairy also provides hints whenever the player gets stuck. There is no limit to the amount of hints that can be used, but players need to wait for the hint to refill before using it again.
The player has an inventory where items collected are stored. The objects are scattered around different locations. The game also features four kinds of mini-games that are repeated throughout the game – memory, jigsaw, mahjong, and tile swap. More of the story unfolds as puzzles are completed. The game interface is similar to that of hidden object games. The menu is located at the lower left side of the window, while the fairy (hint), is located at the lower right part of the window. The inventory can also be accessed from the bottom part of the game screen.