score:4

At this moment 2 / 3 levels are available. See the example: http://jsfiddle.net/6LXVQ/1/

series: [{
        name: 'Things',
        colorByPoint: true,
        data: [{
            name: 'Animals',
            y: 5,
            drilldown: 'animals'
        }]
    }],
    drilldown: {
        series: [{
            id: 'animals',
            name: 'Animals',
            data: [
                {name: 'Cats', 
                 y: 4,
                 drilldown: 'cats'},
                ['Dogs', 2],
                ['Cows', 1],
                ['Sheep', 2],
                ['Pigs', 1]
            ]
        }, {

            id:'cats',
            data: [1,2,3] 
        }]
    }

score:9

have a look at http://jsfiddle.net/6LXVQ/97/ for a 3 level example

    series: [{
        id: 'toplevel',
        name: 'Animals',
        data: [
            {name: 'Cats', y: 4, drilldown: 'level1'},
            {name: 'Dogs', y: 2},
            {name: 'Cows', y: 1},
            {name: 'Sheep',y: 2},
            {name: 'Pigs', y: 1}
        ]
    }],
    drilldown: {
        series: [ { 
            id:'level1',
            name: 'Level 1',
            data: [
                {name: 'Trees', y: 1},
                {name: 'Plants', y: 2},
                {name: 'Grass', y: 3},
                {name: 'Deeper', y: 4, drilldown: 'level2'}
            ] 
        },{                
            id:'level2',
            name: 'Level 2',
            data: [
                {name: 'Green', y:1},
                {name: 'Red', y:2},
                {name: 'Blue', y:3},
                {name: 'Deeper', y: 4, drilldown: 'level3'}
            ] 
        },{
            id: 'level3',
            name: 'Level 3',
            data: [
                {name:'Yes', y:1},
                {name:'it',y:2},
                {name:'works', y:3}
            ]
        }]
    }

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