public function deleteBlocks():void {
    for (var i:uint = 0; i < blocks.length; i++) {
        if (!blocks[i].needtobedeleted) {
            if (blocks[i].colour != G.NULL) {
                var bU:Block = findBlock(blocks[i].x, blocks[i].y - 24);
                if (bU != null) {
                    if (bU.colour == blocks[i].colour) {
                        blocks[i].needtobedeleted = true;
                        bU.needtobedeleted = true;
                    }
                }
                var bR:Block = findBlock(blocks[i].x + 24, blocks[i].y);
                if (bR != null) {
                    if (bR.colour == blocks[i].colour) {
                        blocks[i].needtobedeleted = true;
                        bR.needtobedeleted = true;
                    }
                }
                var bD:Block = findBlock(blocks[i].x, blocks[i].y + 24);
                if (bD != null) {
                    if (bD.colour == blocks[i].colour) {
                        blocks[i].needtobedeleted = true;
                        bD.needtobedeleted = true;
                    }
                }
                var bL:Block = findBlock(blocks[i].x - 24, blocks[i].y);
                if (bL != null) {
                    if (bL.colour == blocks[i].colour) {
                        blocks[i].needtobedeleted = true;
                        bL.needtobedeleted = true;
                    }
                }
            }
        }
    }
    for (i = 0; i < blocks.length; i++) {
        if (blocks[i].needtobedeleted) {
            shards.push(["Block", new Point(blocks[i].x / 24, blocks[i].y / 24), blocks[i].colour, blocks[i].tilelock, blocks[i].ice, (uint(blocks[i].linkU)*10000+uint(blocks[i].linkR)*1000+uint(blocks[i].linkD)*100+uint(blocks[i].linkL)*10),blocks[i].forced]);
            blocks[i] = null;
        }
    }
    for (i = 0; i < blocks.length; i++) {
        while (blocks[i] == null) blocks.splice(i,1);
    }
}