Using this tutorial, you can build a complete working game on BGA environment: Reversi game.
Before reading this tutorial, you must:
Create your first game
With the initial skeleton of code provided initially, you can already start a game from the BGA Studio. For now, we are going to work with 1 player only. Most of the time this is simpler to proceed with only one player during the early phase of development of your game, as it's easy and fast to start/stop games.
Thus, you can start a "Reversi" game, and arrive on a void, empty game. Yeah.