FxNum is a free Android game designed to test and improve players' memory skills. Upon starting the game, five numbers appear briefly on the screen in a specific sequence. Players must pay close attention to the order, as the main objective is to sort these numbers correctly after they disappear. The challenge lies in recalling the exact sequence before selecting the numbers for sorting.

The gameplay is simple yet engaging, making it suitable for players of all ages. Success in the game depends on the player's ability to remember the sequence accurately, providing a fun way to enhance cognitive skills. With its straightforward mechanics and focus on memory retention, FxNum offers a unique and entertaining experience for those looking to challenge their mental acuity.