diff --git a/src/App.svelte b/src/App.svelte
index d91b5a5..25817f5 100644
--- a/src/App.svelte
+++ b/src/App.svelte
@@ -3,7 +3,7 @@
     import * as TailwindUI from "./tailwindui/index"
 
     import Home from "./Home.svelte"
-    import SkillTree from "./SkillTree.svelte"
+    import TreeMap from "./TreeMap.svelte"
     import TopicList from "./TopicList.svelte"
     import TopicDetail from "./TopicDetail.svelte"
     import FormatList from "./FormatList.svelte"
@@ -65,8 +65,8 @@
     <svelte:fragment slot="content">
         {#if currentView === "/home" || currentView === "/"}
             <Home/>
-        {:else if currentView === "/game"}
-            <SkillTree/>
+        {:else if currentView === "/map"}
+            <TreeMap/>
         {:else if currentView === "/topics"}
             <TopicList {alltopics}/>
         {:else if currentView.startsWith("/topic/")}
@@ -97,6 +97,10 @@
             <LibraryIcon class=" flex-shrink-0 h-6 w-6"/>
         </NavButtonWithLabel>
 
+        <NavButtonWithLabel isActive={currentView === "/map"} target="#/map" label="TreeMap">
+            <LibraryIcon class=" flex-shrink-0 h-6 w-6"/>
+        </NavButtonWithLabel>
+
         <NavButtonWithLabel isActive={currentView === "/formats"} target="#/formats" label="Formats">
             <ViewGridIcon class=" flex-shrink-0 h-6 w-6"/>
         </NavButtonWithLabel>
diff --git a/src/TreeMap.svelte b/src/TreeMap.svelte
new file mode 100644
index 0000000..d2a6a54
--- /dev/null
+++ b/src/TreeMap.svelte
@@ -0,0 +1 @@
+<iframe title="treemap" src="/static/map.html" class="w-full h-screen"></iframe>
\ No newline at end of file
diff --git a/static/map.html b/static/map.html
new file mode 100644
index 0000000..9394c40
--- /dev/null
+++ b/static/map.html
@@ -0,0 +1,323 @@
+<!doctype html>
+<html class="no-js" lang="">
+    <head>
+        <meta charset="utf-8">
+        <meta http-equiv="X-UA-Compatible" content="IE=edge">
+        <title>TreeMap</title>
+        <meta name="description" content="">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <style>
+body {
+  margin: 0px;
+  padding: 0px;
+  font-family: 'Open Sans', sans-serif;
+  font-size: 16px;
+}
+
+#chart {
+  margin: 0px;
+  padding: 0px;
+  background: #E0E7FF;
+}
+
+text {
+  pointer-events: none;
+}
+
+.grandparent text {
+  font-weight: bold;
+}
+
+rect {
+  fill: none;
+  stroke: #fff;
+}
+
+rect.parent,
+.grandparent rect {
+  stroke-width: 2px;
+}
+
+.grandparent rect {
+  fill: rgb(232, 255, 0);
+}
+
+.grandparent:hover rect {
+  fill: rgb(202, 225, 0);
+}
+
+.children rect.parent,
+.grandparent rect {
+  cursor: pointer;
+}
+
+.children rect.parent {
+  fill: #99F6E4;
+  fill-opacity: .5;
+}
+
+.children:hover rect.child {
+  fill: #D7CBFA;
+}
+
+        </style>
+	<link href='http://fonts.googleapis.com/css?family=Open+Sans:300' rel='stylesheet' type='text/css'>
+    </head>
+    <body>
+	<p id="chart"></p>
+	<script src="http://d3js.org/d3.v3.min.js"></script>
+    <script type="text/javascript">
+
+function hierarchy(topic_array, parent_id){
+    // this is different from TopicMasonryGrid because this needs a specific object structure down to all leafs, not a map with just 2 levels
+    // every node needs id, name. Leaf nodes need a value like 100. Non-leafs need a children[].
+    // see: https://github.com/mekarpeles/math.mx/blob/master/static/data/simple.json
+    const nest = (items, id) =>
+      items
+      .filter(item => item.parent_id === id)
+      .map(item => ({ ...item, children: nest(items, item.name), value: 100 }))
+      .map(item => {
+        return item.children.length == 0 ?
+        {id: item.name, name: item.name.split("/").reverse()[0], value: 100} :
+        {id: item.name, name: item.name.split("/").reverse()[0], children: item.children}
+      });
+
+    let topnodes = nest(topic_array, ''); // includes childless nodes
+
+    // put childless nodes under misc
+    let misc = {id: 'misc', name: 'Misc', children: topnodes.filter(t => t.value).slice(0,15)};
+
+
+    return {name: "·", children: [...topnodes.filter(t => t.children), misc]};
+}
+
+d3.json("/learn/topics.json?_shape=array&_size=5000", function(alltopics){
+  // console.log({alltopics});
+  var root = hierarchy(alltopics, "");
+  console.log({root});
+  initialize(root);
+  accumulate(root);
+  layout(root);
+  display(root);
+});
+
+var margin = {top: 20, right: 0, bottom: 0, left: 0},
+wh = browserDimensions(),
+width = wh[0] - (2 * margin.left) - (2*margin.right),
+height = wh[1] - (2 * margin.top - margin.bottom),
+formatNumber = d3.format(",d"),
+transitioning;
+
+var x = d3.scale.linear()
+  .domain([0, width])
+  .range([0, width]);
+
+var y = d3.scale.linear()
+  .domain([0, height])
+  .range([0, height]);
+
+var treemap = d3.layout.treemap()
+  .children(function(d, depth) { return depth ? null : d._children; })
+  .sort(function(a, b) { return a.value - b.value; })
+  .ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
+  .round(false);
+
+var svg = d3.select("#chart").append("svg")
+  .attr("width", width + margin.left + margin.right)
+  .attr("height", height + margin.bottom + margin.top)
+  .style("margin-left", -margin.left + "px")
+  .style("margin.right", -margin.right + "px")
+  .append("g")
+  .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
+  .style("shape-rendering", "crispEdges");
+
+var grandparent = svg.append("g")
+  .attr("class", "grandparent");
+
+grandparent.append("rect")
+  .attr("y", -margin.top)
+  .attr("width", width)
+  .attr("height", margin.top);
+
+grandparent.append("text")
+  .attr("x", 6)
+  .attr("y", 6 - margin.top)
+  .attr("dy", ".75em");
+  
+
+
+  function initialize(root) {
+    root.x = root.y = 0;
+    root.dx = width;
+    root.dy = height;
+    root.depth = 0;
+  }
+
+  // Aggregate the values for internal nodes. This is normally done by the
+  // treemap layout, but not here because of our custom implementation.
+  // We also take a snapshot of the original children (_children) to avoid
+  // the children being overwritten when when layout is computed.
+  function accumulate(d) {
+    return (d._children = d.children)
+      ? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
+    : d.value;
+  }
+
+  // Compute the treemap layout recursively such that each group of siblings
+  // uses the same size (1×1) rather than the dimensions of the parent cell.
+  // This optimizes the layout for the current zoom state. Note that a wrapper
+  // object is created for the parent node for each group of siblings so that
+  // the parent’s dimensions are not discarded as we recurse. Since each group
+  // of sibling was laid out in 1×1, we must rescale to fit using absolute
+  // coordinates. This lets us use a viewport to zoom.
+  function layout(d) {
+    if (d._children) {
+      treemap.nodes({_children: d._children});
+      d._children.forEach(function(c) {
+        c.x = d.x + c.x * d.dx;
+        c.y = d.y + c.y * d.dy;
+        c.dx *= d.dx;
+        c.dy *= d.dy;
+        c.parent = d;
+        layout(c);
+      });
+    }
+  }
+
+  function display(d) {
+    grandparent
+      .datum(d.parent)
+      .on("click", transition)
+      .select("text")
+      .text(name(d));
+
+    var g1 = svg.insert("g", ".grandparent")
+      .datum(d)
+      .attr("class", "depth");
+
+    var g = g1.selectAll("g")
+      .data(d._children)
+      .enter().append("g");
+
+    g.filter(function(d) { return d._children; })
+      .classed("children", true)
+      .on("click", transition);
+
+    g.selectAll(".child")
+      .data(function(d) { return d._children || [d]; })
+      .enter().append("rect")
+      .attr("class", "child")
+      .call(rect);
+
+    g.append("rect")
+      .attr("class", "parent")
+      .call(rect)
+      .append("title")
+      .text(function(d) { return formatNumber(d.value); });
+
+    g.append("text")
+      .attr("dy", ".75em")
+      .text(function(d) { return d.name.split('{')[0].split('(')[0]
+			  .split('[')[0]; })
+      .call(text);
+
+    function transition(d) {
+      if (transitioning || !d) return;
+      transitioning = true;
+
+      var g2 = display(d),
+      t1 = g1.transition().duration(750),
+      t2 = g2.transition().duration(750);
+
+      // Update the domain only after entering new elements.
+      x.domain([d.x, d.x + d.dx]);
+      y.domain([d.y, d.y + d.dy]);
+
+      // Enable anti-aliasing during the transition.
+      svg.style("shape-rendering", null);
+
+      // Draw child nodes on top of parent nodes.
+      svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
+
+      // Fade-in entering text.
+      g2.selectAll("text").style("fill-opacity", 0);
+
+      // Transition to the new view.
+      t1.selectAll("text").call(text).style("fill-opacity", 0);
+      t2.selectAll("text").call(text).style("fill-opacity", 1);
+      t1.selectAll("rect").call(rect);
+      t2.selectAll("rect").call(rect);
+
+      // Remove the old node when the transition is finished.
+      t1.remove().each("end", function() {
+        svg.style("shape-rendering", "crispEdges");
+        transitioning = false;
+      });
+    }
+
+    return g;
+  }
+
+  function text(text) {
+    text.attr("x", function(d) { return x(d.x) + 10; })
+      .attr("y", function(d) { return y(d.y) + 10; });
+  }
+
+  function rect(rect) {
+    rect.attr("x", function(d) { return x(d.x); })
+      .attr("y", function(d) { return y(d.y); })
+      .attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
+      .attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
+  }
+
+  function name(d) {
+    return d.parent
+      ? name(d.parent) + " → " + d.name
+      : d.name;
+  }
+
+function wrap(text, width) {
+  text.each(function() {
+    var text = d3.select(this),
+    words = text.text().split(/\s+/).reverse(),
+    word,
+    line = [],
+    lineNumber = 0,
+    lineHeight = 1.1, // ems
+    y = text.attr("y"),
+    dy = parseFloat(text.attr("dy")),
+    tspan = text.text(null).append("tspan").attr("x", 0).attr("y", y).attr("dy", dy + "em");
+    while (word = words.pop()) {
+      line.push(word);
+      tspan.text(line.join(" "));
+      if (tspan.node().getComputedTextLength() > width) {
+        line.pop();
+        tspan.text(line.join(" "));
+        line = [word];
+        tspan = text.append("tspan").attr("x", 0).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word);
+      }
+    }
+  });
+}
+function browserDimensions() {
+  var w = 0, h = 0;
+  if( typeof( window.innerWidth ) == 'number' ) {
+    //Non-IE
+    w = window.innerWidth;
+    h = window.innerHeight;
+  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
+    //IE 6+ in 'standards compliant mode'
+    w = document.documentElement.clientWidth;
+    h = document.documentElement.clientHeight;
+  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
+    //IE 4 compatible
+    w = document.body.clientWidth;
+    h = document.body.clientHeight;
+  }
+  return [w, h];
+}
+
+
+        </script>
+    </body>
+</html>
\ No newline at end of file
diff --git a/templates/courses/physics.md b/templates/courses/physics.md
deleted file mode 100644
index e69de29..0000000
