Alien Eggs' lobby sign is a single, green outline of an egg.
Similarly to Coin Fiends in Platform Racing 3, players compete against each other in this mode by grabbing Alien Eggs, with the one with the highest amount declared the winner. Eggs continually spawn the map at random points throughout the match and can walk on all sides of blocks. They can also attack the player with a Laser Gun, Sword, or Ice Wave.
Originally, the eggs didn't attack players and only walked around, which is why the mode's initial name was Walking Eggs. The mode was updated a week after its release on 2013-04-02 that gave them weapons and its final name. Jiggmin stated he planned to include this all along, but didn't have enough time to meet that Motley Monday's deadline and chose to save the rest for the week after.