Actual project things

Assets/PlayAreaWall.cs

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+using UnityEngine;
+using System.Collections;
+
+[ExecuteInEditMode]
+public class PlayAreaWall : MonoBehaviour {
+    public enum DirectionEnum
+    {
+        North,
+        South,
+        East,
+        West
+    }
+
+    public DirectionEnum Direction;
+    public Transform PlayArea;
+
+	// Use this for initialization
+	void Start () {
+    }
+	
+	// Update is called once per frame
+	void Update () {
+        if (Direction == DirectionEnum.North)
+        {
+            transform.position = new Vector3(0F, transform.localScale.y / 2.0F, PlayArea.localScale.z / 2.0F + transform.localScale.z / 2.0F);
+        }
+	}
+}