The blocks in this game are called keydrons and come in a variety of shapes. Pass through the hole in the wall by rotating the keydron to appropriately fit through.
Control the keydrons by using the Wii Remote and Nunchuk. (ThruSpace is also compatible with the Classic Controller and Classic Controller Pro.)
Move the keydrons in the desired direction by moving the analog stick up, down, left, or right. A silhouette of the blocks will appear on the wall. Use the silhouette to guide you through the gap.