Man (or boy) In Black finds Senet game on beach, convinces Jacob to play

As a young Man In Black walks along the beach, he discovers a game on the beach. The game is Senet is believed to be the oldest board game in the world, originating in ancient Egypt as far back as 3,100 B.C.

As he picks up the game, he looks out at the sea, or "Across the Sea." He goes and sits on a log and begins to set up the game with black and white stones. Young Jacob approaches him and asks what he has. MIB explains that it's a game that you play, and when Jacob asks how he knows how to play, MIB says "I just know."

MIB makes Jacob promise not to tell Mother about the game because he thinks she'll take it away. Jacob looks a the white piece and when MIB asks if he wants to play, Jacob says yes.

So this is certainly very similar to Locke's backgammon game in season 1. Senet is considered to be a precursor to backgammon. The game also gives us a general idea of when all of this is taking place. It would certainly seem to be sometime before the birth of Christ (B.C.), meaning that Jacob and MIB have been on the island for at least 2,000 years, if not quite a bit longer.

You'll also notice that one of the symbols on one of the squares is an ankh, the symbol we've seen a number of times, most notably this season when it was revealed that it was what was in the guitar case Hurley had been carrying.