http://www.shibuya24.info/entry/2015/08/04/115000 でも多少変更が必要

OnTriggerEnter2DとかOnCollisionEnter2Dの分かりやすいまとめ https://qiita.com/ppr007/items/8eee1de552601a8a8f1f

http://www.clrmemory.com/unity/homing-obj-script/ ２ｄで追尾させる方法。 Player = GameObject.Find ("Player"); んところ タグでも。 Player = GameObject.FindGameObjectWithTag("Player");