The Gym On the screen The Gym  The Brain Gain meter shows the Agent’s progress towards their next sticker. The icons launch the games. Numberjack 7 is always there to give spoken help if needed. Use the following links for details of the individual games: The Gym has a range of active games to play, helping children to develop their mathematical understanding in a range of ways. Each game can be played at a number of different levels, to encourage younger children and challenge older ones.