This interactive treemap visualizes the top 100 best-selling video games, grouped by gaming platform, with each tile’s size and color representing sales value and platform category. Hovering over a tile displays a tooltip with the game’s name, platform, and sales figures. The visualization uses D3 v4’s `d3.treemap()` and `d3.hierarchy()` to layout the hierarchical data, which is loaded as JSON from an external source, and renders to SVG.