Reversi for Android consists of a reversi engine and a GUI. The application accepts moves through the touch screen the trackball or through the keyboard. An optional "move coach" shows all valid moves as ghost stones and animation highlights the new and flipped stones after each engine move. Full game navigation enables users to correct mistakes or analyze games. The engine plays at various levels (including random and free-play). The user can play either side.

Manual at:
http://www.aartbik.com/android_manual.php