public void checkLeft(Node node) {
		this.left = -1; // reset value to -1
		// Prevent out of bounds (negative coordinates)
		if((node.getY()-1) >= 0) {
			if(checkWall(new Node( (node.getX()), (node.getY()-1) ))) {
				if(this.closedNodes.size()==0)
					this.left = 1;
				else {
					for(int i = 0; i < this.closedNodes.size(); i++) {
						// Check with closed nodes to differenciate explored or not
						if(new Node(node.getX(), node.getY()-1).compareTo(this.closedNodes.get(i))==1) {
							this.left = 2; // explored node
							break;
						}
						else
							this.left = 1; // empty
					}
				}
			} else {
				this.left = 0; // set 0 to specify as wall
			}
		}
	}