Fat Brain Toys GridBlock Brain Jogging without being blocked? Players alternately place their tiles on the playing field. The rules are simple – stones of the same colour must touch, and stones of the same shape must not touch. At the same time, as many pens as possible should be kept open next to your own figures. Anyone who can place the most tiles on the field or who has the most open pens around their tiles wins the game! Age: from 8 years 2 – 4 players.