// in ButtonGame.cs
void Start () {
        Vector3 position;
        for (int i = 1; i < 5; i++) {
            position = new Vector3(Screen.width * 0.2f * i, 100, camera2d.nearClipPlane + 1);
            Instantiate(consoleButton, camera2d.ScreenToWorldPoint(position), Quaternion.identity);
        }
    }

// then in ButtonTest.cs
    void OnMouseDown()
    {
        Debug.Log("button on mouse down");
        redButton.gameObject.SetActive(false);
    }