Swipe in the directionn you wish to move. The maps feature elevation changes and boxes, which you may move by swiping. You can only move one box in a given direction, any more and you will not move. The levels feature either moving the boxes out of the way, or moving them so that they form a path between islands by which you may go through (which are shown by blue blocks; effectively a broken bridge). Be careful not to drop elevation before all of your boxes have also dropped in elevation, you cannot climb walls.