Black Eggs are items which have appeared in several of the Rusty Lake games. They are possibly edible.
Cube Escape: SeasonsEdit
During the Spring, when the player feeds bird seed to Harvey, she will lay a black egg. The egg can then be cooked in a pan and placed in the egg cup to the left of the stove. Cracking the egg with a spoon releases black butterflies. Once it is fully opened, a beam of light shoots from the egg and reveals a black cube.
Cube Escape: Harvey's BoxEdit
Inside of the box in the first section of the game there is a black speckled egg, lying next to a Fish. After the player has a vision through a Durian fruit and the box arrives at the Lake, the egg is replaced, possibly hatching, and Mr. Crow appears. The player can adjust his pose in order to help escape the box.
Cube Escape: Case 23Edit
In the living room of the Woman, there is a set of Russian nesting dolls. If the player follows the sequence of items into the dolls, the Woman doll opens to give a black egg. The egg can then be placed into the Harvey doll, which in turn gives the player a key.
Back at Dale's office, the player can unscrew the grate off of the vent to get to a cat sitting inside. After shaving off Dale's beard in the mirror, attempting to flush the hair down the sink causes it to clump together and form a baby crow. The crow is fed to the cat, which will eventually vacate the vent and leave a black egg. When the code 746 is logged into his TV, the Woman appears on the screen. She reaches her arm up, and a hand comes through the TV. Once she is given the black egg, she turns it into a white cube and hands it back.
Cube Escape: TheatreEdit
The egg is featured as part of the third play, "The Fish and the Parrot". After adjusting a maze of pipes and feeding Harvey seeds from a pink flower, she will lay a black egg. The egg must then be passed through the same series of pipes to reach a frying pan, where it will break open to reveal a worm. The play ends when the Fish is fed the worm.
Rusty Lake: RootsEdit
When James moves into his new house in 1860, he needs to find three diamonds to unlock the front door. After knocking down a bird's nest from the roof, the player will see a single black egg inside. Tapping on the egg hatches a baby crow that flies away after being fed a worm, leaving behind a green diamond.
In the secret alchemist laboratory underneath the Vanderboom house, Aldous and William are trying to create the Elixir of Life. Mixing together chalk and dust creates a black egg. Then, when the egg and a glass bottle are combined, the Elixir is complete.