diff --git a/src/main.zig b/src/main.zig
index fa6b81b..56df003 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -25,12 +25,23 @@ var scene_height: u32 = 0;
 var paused: bool = false;
 var step: u32 = 0;
 
+var dragging: bool = false;
+var mouseX: u32 = 0;
+var mouseY: u32 = 0;
+
+var SELECTED_PATTERN_BUFFER = [_]u8{ 'o', '!' } ++ [_]u8{0} ** 998;
+
 // NOTE: Usage -
 // const msg = std.fmt.allocPrint(allocator, "", .{ }) catch return;
 // defer allocator.free(msg);
 // debug_print(msg.ptr, @intCast(msg.len));
 extern fn debug_print(message: [*]const u8, length: u8) void;
 
+export fn alloc(length: u8) [*]const u8 {
+    const memory = allocator.alloc(u8, length) catch unreachable;
+    return memory.ptr;
+}
+
 export fn set_window_dimensions(w: u32, h: u32) void {
     width = w;
     height = h;
@@ -43,12 +54,30 @@ export fn get_output_buffer_pointer() *[OUTPUT_BUFFER_SIZE]u8 {
     return &OUTPUT_BUFFER;
 }
 
-export fn pause() void {
+export fn pause() bool {
     paused = !paused;
+    return paused;
+}
+
+export fn clear() void {
+    @memset(&SCENE_BUFFER, 0);
+}
+
+export fn click() void {
+    place_cells();
+}
+
+export fn set_dragging(isDragging: bool) void {
+    dragging = isDragging;
+}
+
+export fn move_mouse(x: u32, y: u32) void {
+    mouseX = x;
+    mouseY = y;
 }
 
-export fn mouse_click(x: u32, y: u32) void {
-    SCENE_BUFFER[(y / CELL_SIZE * scene_width + x / CELL_SIZE)] = 1;
+export fn select_pattern(rle: [*]const u8) void {
+    @memcpy(&SELECTED_PATTERN_BUFFER, rle);
 }
 
 export fn setup() void {
@@ -63,9 +92,61 @@ export fn setup() void {
     SCENE_BUFFER[(y * scene_width + x)] = 1;
 }
 
+fn place_cells() void {
+    var dx: usize = 0;
+    var dy: usize = 0;
+    var run_count: usize = 0;
+    var cell_value: u8 = 0;
+    for (SELECTED_PATTERN_BUFFER) |code| {
+        switch (code) {
+            '0'...'9' => {
+                run_count *= 10;
+                run_count += code - '0';
+                continue;
+            },
+            'o' => {
+                cell_value = 1;
+            },
+            'b' => {
+                cell_value = 0;
+            },
+            '!' => {
+                break;
+            },
+            '$' => {
+                dy += 1;
+                dx = 0;
+                run_count = 0;
+                continue;
+            },
+            else => unreachable,
+        }
+
+        for (0..@max(1, run_count)) |_| {
+            SCENE_BUFFER[(mouseY / CELL_SIZE + dy) * scene_width + mouseX / CELL_SIZE + dx] = cell_value;
+            dx += 1;
+        }
+        run_count = 0;
+    }
+}
+
 export fn draw() void {
     @memset(&OUTPUT_BUFFER, 0);
 
+    // Draw cursor
+    {
+        const sx = mouseX / CELL_SIZE;
+        const sy = mouseY / CELL_SIZE;
+        for (0..CELL_SIZE) |c_xi| {
+            for (0..CELL_SIZE) |c_yi| {
+                const x = sx * CELL_SIZE + c_xi;
+                const y = sy * CELL_SIZE + c_yi;
+                draw_pixel(x, y, .{ .r = 255, .g = 255, .b = 255, .a = 150 });
+            }
+        }
+    }
+
+    // Draw (live) cells
     for (0..scene_width * scene_height) |c_i| {
         if (SCENE_BUFFER[c_i] == 1) {
             const sx = c_i % scene_width;
@@ -126,6 +207,10 @@ export fn draw() void {
         SCENE_BUFFER = TEMP_SCENE_BUFFER;
         step += 1;
     }
+
+    if (dragging) {
+        place_cells();
+    }
 }
 
 fn draw_pixel(x: u32, y: u32, c: Color) void {
diff --git a/web/bin/zonzai.wasm b/web/bin/zonzai.wasm
index aca7723..eae8bc9 100755
Binary files a/web/bin/zonzai.wasm and b/web/bin/zonzai.wasm differ
diff --git a/web/index.html b/web/index.html
index a9b757c..7fb63c5 100644
--- a/web/index.html
+++ b/web/index.html
@@ -7,24 +7,41 @@
     <script defer src="./main.js"></script>
     <link rel="stylesheet" href="style.css" />
     <link rel="shortcut icon" href="#" type="image/x-icon" />
+
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link
+      href="https://fonts.googleapis.com/css2?family=Pixelify+Sans:wght@400..700&display=swap"
+      rel="stylesheet"
+    />
   </head>
 
   <body>
-    <p id="fps"></p>
-    <button id="pauseBtn">pause</button>
-    <canvas class="canvas"> </canvas>
+    <div class="gameContainer">
+      <div class="gameHeader">
+        <h1>Zonzai</h1>
+      </div>
+      <canvas class="canvas"> </canvas>
+      <div class="gameFooter">
+        <div class="gameControls">
+          <button id="pause-btn" class="btn">pause</button>
+          <button id="clear-btn" class="btn">clear</button>
+        </div>
+        <div id="pattern-palette"></div>
+        <p id="fps"></p>
+      </div>
+    </div>
 
-    <p style="color: white">
-      This is Conway's game of life, cells can be placed with the mouse. I'll
-      next add a menu of pre-made patterns that can be placed.
-    </p>
-    <p style="color: white">
-      There was a tree simulator here, but I removed it in the transition to a
-      cellular automata approach. Simulating plants is very difficult, yet I
-      just had the idea of a CA where cells store resources (like water) and
-      transfer them out to neighbors with osmosis. If a cell has an abundance of
-      nutrients it could grow a neighbor and if it has a derth it will die.
-      Still need to figure out how to model light and branching.
-    </p>
+    <div class="description">
+      <p>This is Conway's game of life. Cells can be placed with the mouse.</p>
+      <p>
+        There was a tree simulator here, but I removed it in the transition to a
+        cellular automata approach. Simulating plants is very difficult, yet I
+        just had the idea of a CA where cells store resources (like water) and
+        transfer them out to neighbors with osmosis. If a cell has an abundance
+        of nutrients it could grow a neighbor and if it has a derth it will die.
+        Still need to figure out how to model light and branching.
+      </p>
+    </div>
   </body>
 </html>
diff --git a/web/main.js b/web/main.js
index aa08b67..b03a88b 100644
--- a/web/main.js
+++ b/web/main.js
@@ -3,6 +3,30 @@ let canvas
 let canvasContext
 let canvasImageData
 
+let dragging
+let mousedown
+
+const CELL_SIZE = 5
+
+const EXAMPLE_PATTERNS = [
+  {
+    name: "Cell",
+    rle: "o!",
+  },
+  {
+    name: "Glider",
+    rle: "bob$2bo$3o!",
+  },
+  {
+    name: "70P23",
+    rle: "24bo$12bo9b3o$o11b3o6bo$3o5b2o5bo5b2o$3bo4b2o4b2o$2b2o$19bobo$19bobo$3b2o14b3o3b2o$3b2o3b3o14b2o$8bobo$8bobo$26b2o$14b2o4b2o4bo$7b2o5bo5b2o5b3o$8bo6b3o11bo$5b3o9bo$5bo!",
+  },
+  {
+    name: "p24 gliderless LWSS gun",
+    rle: "24b2o3b2o$2b2obo2bo15bobobo2bo$o2bob4o17bob4o$2o24bo2bo2b2o$4bob2obo9b2o3bobo3b2o2bo$2ob4ob2o9bo3b3o7b2o$o3bo12bobobob2o$b4o11bobo2bob2o$5b2o3b2o4bobob3o$3b4o3bobob2obobo$2bo3bo5bobo2bo12bo2bobo$bobo8bo3b2o10b2obob3o$bo2b2o3b3o8b2o7bo6bo$2b2obo4b2o8b2o6b2o5bo$5b3o4b3o5bo$6b2ob2o3b2o5bo7bo5b2o$b2ob2obob2o3b2o6b2o4bo6bo$obobo9b2o6b3o4b3obob2o$bo3b6o3bo14bobo2bo$7bo3bo9b2o$10bo10bo$10bo3bo6bo$6bo8bo$7b2o2bo3bo6bo2bo8bo2bo$5b2o9b2o8bo11bo$7bo5bo4bo3bo3bo7bo3bo$12bobo3bo4b4o8b4o$13bo4bo$7b2o3bo3b2o$6bobo3bo2bo$6bo4bo3bo$5b2o5bo2$8b2o8b2o$8bo2b6o2bo$9b2o6b2o$6b3o10b3o$6bo2bobo4bobo2bo$7b2o4b2o4b2o!",
+  },
+]
+
 const debug_print = (location, size) => {
   var buffer = new Uint8Array(instance.exports.memory.buffer, location, size)
   var decoder = new TextDecoder()
@@ -14,29 +38,55 @@ let frameTime = performance.now()
 let lastFpsUpdateMS = new Date().getTime()
 let prevFrameIntervals = []
 
+const patternPaletteElement = document.getElementById("pattern-palette")
 const fpsElement = document.getElementById("fps")
-const pauseBtnElement = document.getElementById("pauseBtn")
+const pauseBtnElement = document.getElementById("pause-btn")
+const clearBtnElement = document.getElementById("clear-btn")
 
 pauseBtnElement.addEventListener("click", () => {
-  instance.exports.pause()
+  const pauseResult = instance.exports.pause()
+  pauseBtnElement.innerText = pauseResult ? "unpause" : "pause"
+})
+
+clearBtnElement.addEventListener("click", () => {
+  instance.exports.clear()
 })
 
 const setCanvasDimensions = () => {
-  canvas.width = window.innerWidth
-  canvas.height = window.innerHeight
+  canvas.width = Math.floor((window.innerWidth * 0.96) / CELL_SIZE) * CELL_SIZE
+  canvas.height = Math.floor((window.innerHeight - 240) / CELL_SIZE) * CELL_SIZE
   instance.exports.set_window_dimensions(canvas.width, canvas.height)
   canvasImageData = canvasContext.createImageData(canvas.width, canvas.height)
 }
 
 window.addEventListener("resize", setCanvasDimensions)
 
-const memory = new WebAssembly.Memory({
-  initial: 1000,
-  maximum: 65536,
+EXAMPLE_PATTERNS.forEach((p) => {
+  const patternButtonElement = document.createElement("button")
+  patternButtonElement.classList.add("btn")
+  patternButtonElement.innerText = p.name
+  patternButtonElement.addEventListener("click", () => {
+    // TODO: There's definitely a better way to do this w/o allocating
+    // cause I just copy it into the same fixed buffer
+    const rleBuffer = Uint8Array.from(
+      Array.from(p.rle).map((letter) => letter.charCodeAt(0)),
+    )
+
+    var ptr = instance.exports.alloc(rleBuffer.length)
+    var mem = new Uint8Array(
+      instance.exports.memory.buffer,
+      ptr,
+      rleBuffer.length,
+    )
+    mem.set(new Uint8Array(rleBuffer))
+
+    instance.exports.select_pattern(ptr)
+    console.log(p.rle, p.rle.length)
+  })
+  patternPaletteElement.appendChild(patternButtonElement)
 })
 
 WebAssembly.instantiateStreaming(fetch("./bin/zonzai.wasm"), {
-  js: { mem: memory },
   env: {
     debug_print: debug_print,
   },
@@ -47,18 +97,43 @@ WebAssembly.instantiateStreaming(fetch("./bin/zonzai.wasm"), {
   canvasContext = canvas.getContext("2d")
   setCanvasDimensions()
 
-  let mousedown = false
+  let mousePosition = { x: 0, y: 0 }
+
+  canvas.addEventListener("mouseup", (e) => {
+    mousedown = false
+    dragging = false
+    instance.exports.set_dragging(false)
+  })
 
   canvas.addEventListener("mousedown", (e) => {
     mousedown = true
-    instance.exports.mouse_click(e.x, canvas.height - e.y)
   })
-  canvas.addEventListener("mouseup", (e) => {
-    mousedown = false
+
+  canvas.addEventListener("click", (e) => {
+    instance.exports.click()
   })
+
   canvas.addEventListener("mousemove", (e) => {
-    if (mousedown) {
-      instance.exports.mouse_click(e.x, canvas.height - e.y)
+    if (dragging) {
+      instance.exports.set_dragging(true)
+    }
+
+    let canvasBoundingRect = canvas.getBoundingClientRect()
+    const newMousePosition = {
+      x: e.x - canvasBoundingRect.left,
+      y: canvas.height + canvasBoundingRect.top - e.y,
+    }
+    if (
+      mousePosition.x !== newMousePosition.x ||
+      mousePosition.y !== newMousePosition.y
+    ) {
+      if (mousedown) {
+        dragging = true
+      } else {
+        dragging = false
+      }
+      instance.exports.move_mouse(newMousePosition.x, newMousePosition.y)
+      mousePosition = newMousePosition
     }
   })
 
diff --git a/web/style.css b/web/style.css
index 8d50711..61d713f 100644
--- a/web/style.css
+++ b/web/style.css
@@ -1,9 +1,15 @@
 * {
   user-select: none;
+
+  font-family: "Pixelify Sans", sans-serif;
+  font-optical-sizing: auto;
+  font-weight: 400;
+  font-style: normal;
+  color: white;
 }
 
 :root {
-  background-color: black;
+  background-color: rebeccapurple;
 }
 
 body {
@@ -11,28 +17,71 @@ body {
 }
 
 .canvas {
-  height: 100vh;
-  width: 100vw;
+  background-color: black;
   image-rendering: pixelated;
-  flex: 1;
+}
+
+.gameContainer {
+  height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+}
+
+.gameHeader {
+  height: 80px;
+}
+
+.gameFooter {
+  height: 120px;
+  width: 100%;
+  display: flex;
+  flex-direction: row;
+  justify-content: space-around;
+  align-items: center;
+  column-gap: 20px;
+  flex-wrap: wrap;
+}
+
+.gameControls {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  gap: 20px;
+}
+
+#pattern-palette {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  gap: 10px;
 }
 
 #fps {
-  position: absolute;
-  top: 0;
-  right: 0;
-  background-color: black;
-  padding: 12px;
-  margin: 0;
   color: white;
+  width: 80px;
+  text-align: center;
 }
 
-#pauseBtn {
-  position: absolute;
-  top: 0;
-  left: 0;
-  background-color: black;
+#pause-btn {
+  width: 80px;
+}
+
+.btn {
   padding: 12px;
-  margin: 0;
   color: white;
+  background-color: #442277;
+  border: none;
+  border-radius: 6px;
+  box-shadow: 1px 1px 5px rgb(0 0 0 / 15%);
+}
+
+.btn:hover {
+  background-color: #402066;
+}
+
+.description {
+  max-width: 640px;
+  margin: 0 auto;
+  padding: 0 3vw 40px 3vw;
 }