On the first hours of Easter Sunday and right after “Christ has risen” Greek Orthodox crack red eggs during dinner. This tradition-while fun as a game-has the symbolism of resurrection and new life. The egg is seen by followers of Christianity as a symbol of resurrection: while being dormant it contains a new life sealed within it.
Easter eggs are dyed red to represent the blood of Christ, shed on the Cross, and the hard shell of the egg symbolizes the sealed Tomb of Christ—the cracking of which symbolizes his resurrection from the dead.
While the origin of Easter eggs can be explained in the symbolic terms described above, a sacred tradition among followers of Eastern Christianity says that Mary Magdalene was bringing cooked eggs to share with the other women at the tomb of Jesus, and the eggs in her basket miraculously turned brilliant red when she saw the risen Christ.The egg represents the boulder of the tomb of Jesus.
How to do it: Here’s an easy and natural way to dye your Easter Eggs
A different, but not necessarily conflicting legend concerns Mary Magdalene’s efforts to spread the Gospel. According to this tradition, after the Ascension of Jesus, Mary went to the Emperor of Rome and greeted him with “Christ has risen,” whereupon he pointed to an egg on his table and stated, “Christ has no more risen than that egg is red.” After making this statement it is said the egg immediately turned blood red.
The game is called tsougrisma (τσουγκρισμα in Greek) and it involves two players and red eggs.
Each player holds a red egg, and one taps the end of her/his egg lightly against the end of the other player’s egg. The goal is to crack the opponent’s egg. When one end is cracked, the winner uses the same end of her/his egg to try to crack the other end of the opponent’s egg.
The player who successfully cracks the eggs of the other players is declared the winner and, it is said, will have good luck during the year.
(with information from Wikipedia and about.com)