（サンプルコード）

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Block : MonoBehaviour
{
    public GameObject blockPrefab;

    void Start()
    {
        int[][] blockImage =
        {
            new int[] {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0},
            new int[] {0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0},
            new int[] {0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0},
            new int[] {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1},
            new int[] {1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1},
            new int[] {1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1},
            new int[] {0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0},
            new int[] {0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0},
            new int[] {1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0},
            new int[] {1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0},
            new int[] {1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1},
            new int[] {1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1},
            new int[] {1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1},
            new int[] {0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0}
        };

        print(blockImage.Length);
        print(blockImage[0].Length);

        for(int i = 0; i < blockImage.Length; i++)
        {
            for(int j = 0; j < blockImage[i].Length; j++)
            {
                print(blockImage[i][j]);

                if (blockImage[i][j] == 1)
                {
                    Instantiate(blockPrefab, new Vector3(i, 0.5f, j), Quaternion.identity);
                }
            }
        }
    }
}

（実行結果）