[
    {
        "size": [5, 5],
        "difficulty": "easy"
    },
    {
        "size": [5, 5],
        "difficulty": "medium"
    },
    {
        "size": [5, 5],
        "difficulty": "hard"
    },
    {
        "size": [7, 7],
        "difficulty": "easy"
    },
    {
        "size": [7, 7],
        "difficulty": "medium"
    },
    {
        "size": [7, 7],
        "difficulty": "hard"
    },
    {
        "size": [10, 10],
        "difficulty": "easy"
    },
    {
        "size": [10, 10],
        "difficulty": "medium"
    },
    {
        "size": [10, 10],
        "difficulty": "hard"
    },
    {
        "size": [3, 3],
        "difficulty": "easy"
    },
    {
        "size": [3, 3],
        "difficulty": "medium"
    },
    {
        "size": [3, 3],
        "difficulty": "hard"
    },
    {
        "size": [8, 6],
        "difficulty": "easy"
    },
    {
        "size": [8, 6],
        "difficulty": "medium"
    },
    {
        "size": [8, 6],
        "difficulty": "hard"
    }
]