Title screen from Space Eggs
Space Eggs is an unofficial port of the arcade game Moon Cresta to the Apple II. In the game the player moves a ship from side to side across the bottom of the screen while trying to avoid colliding with or being shot by the aliens attacking above. Each level pits the player against multiple aliens of a particular class, which become more difficult to destroy as the levels progress.
The game begins with a view of the player's three ships docked together. The first ship, which is the smallest and has only one cannon, splits off from the others and gameplay begins. If an alien touches the ship or successfully hits it with a bomb, the ship is destroyed and replaced by the next one in the set. The second and third ships have progressively wider wingspans and two cannons each. The game ends when all ships are lost.
Aliens begin as harmless, multi-colored "eggs" bobbing randomly above the ship, and must be shot to release the creatures within. The four classes of alien are:
- Monsters, insect-like creatures that move randomly around the screen and are worth 15 points.
- Giant lips, which drop bombs and must be shot twice to be destroyed. 30 points.
- Space wolves, which move randomly and often descend to the level of the spaceship. Worth 45 points.
- Killer fuzz balls, which bounce up and down rapidly if they are to the left of the ship, or move to the bottom of the playfield and slide horizontally toward the ship if they are to the right (guaranteeing destruction). Must be shot twice. 80 points.
Occasionally between levels, a "power up" descends from the top of the screen and, if properly caught by the player, docks with the player's ship, increasing the number of cannons. This power-up is lost if the ship is destroyed.