In Pylos, you want to be one who places the final ball on top of the pyramid.

At the start of the game, each player has fifteen balls and they take turns placing them on a game board that has sixteen indentations on it in a 4x4 grid. Once four balls have been placed next to one another in a square, a ball can be placed on top of them, forming a second level of play. Then, players can place balls on this second level, eventually allowing a ball to be placed on the third level and once that level is full, which requires only four balls, a final ball can be placed on the fourth level, with that player winning the game.