start level struct

{
    "items": [
        {
            "object_type": "red_box",
            "min_condition": 1,
            "max_condition": 3,
            "points_for_box": 80,
            "bonus_for_condition": 10,
            "rate": 10
        },
        {
            "object_type": "blue_box",
            "min_condition": 1,
            "max_condition": 3,
            "points_for_box": 20,
            "bonus_for_condition": 5,
            "rate": 50
        },
        {
            "object_type": "green_box",
            "min_condition": 2,
            "max_condition": 3,
            "points_for_box": 50,
            "bonus_for_condition": 30,
            "rate": 30
        },
        {
            "object_type": "trash_box",
            "min_condition": 1,
            "max_condition": 3,
            "rate": 50
        }
    ],
    "scene_settings": {
        "conveyor_count": 2,
        "start_speed": 6,
        "max_speed": 12,
        "accelerate": 1,
        "accelerate_delay": 3,
        "endpoint_settings": {
            "count": 2,
            "endpoints": [
                {
                    "box_need": "red_box",
                    "min_condition": 1,
                    "fine_for_mistake": 80,
                },
                {
                    "box_need": "green_box",
                    "min_condition": 3,
                    "fine_for_mistake": 100,
                }
            ]
        }
    }
    "requirements": [
        {
            "req_type": "deliver_object",
            "count": 10,
            "min_condition": 1,
            "object_type": "red_box"
        },
        {
            "req_type": "score",
            "count": 1000
        },
    ]
}