diff --git a/CMakeLists.txt b/CMakeLists.txt
index 284162b..b383753 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,4 +30,4 @@ add_custom_target(
         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
 )
 
-add_executable(Z_DUMMY_TARGET ${SRC_LIST} src/display/Display.h src/display/Pixel.h src/mode/GameOfLife/Cell.h)
+add_executable(Z_DUMMY_TARGET ${SRC_LIST} src/mode/Test/Border.h)
diff --git a/platformio.ini b/platformio.ini
index 4b30716..f046059 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -12,3 +12,8 @@
 platform = espressif32
 board = esp32dev
 framework = arduino
+lib_deps = https://github.com/adafruit/Adafruit_NeoPixel
+upload_port = /dev/ttyUSB0
+upload_speed = 921600
+monitor_port = /dev/ttyUSB0
+monitor_speed = 115200
diff --git a/src/display/Display.h b/src/display/Display.h
index 9b377a2..38c7dbd 100644
--- a/src/display/Display.h
+++ b/src/display/Display.h
@@ -2,83 +2,59 @@
 #define DISPLAY_H
 
 #include "Pixel.h"
+#include "Adafruit_NeoPixel.h"
 
 class Display {
 
+public:
+
+    const uint8_t width;
+
+    const uint8_t height;
+
+    const uint16_t pixelCount;
+
 private:
 
-    uint8_t width;
-
-    uint8_t height;
-
-    Pixel *pixels;
-
-    uint16_t pixelCount;
-
-    bool dirty = true;
+    Adafruit_NeoPixel leds;
 
 public:
 
     Display(uint8_t width, uint8_t height) :
-      width(width), height(height) {
-      pixelCount = width * height;
-      pixels = (Pixel *) malloc(pixelCount * sizeof(Pixel));
-      clear();
-    }
-
-    ~Display() {
-      if (pixels != nullptr) {
-        free(pixels);
-        pixels = nullptr;
-      }
-    }
-
-    uint8_t getWidth() const {
-      return width;
-    }
-
-    uint8_t getHeight() const {
-      return height;
-    }
-
-    uint16_t getPixelCount() const {
-      return pixelCount;
-    }
-
-    void set(uint8_t x, uint8_t y, Pixel pixel) {
-      if (x > width || y > height) {
-        Serial.printf("ERROR: Cannot set pixel (%d/%d) in matrix (%d/%d).\n", x, y, width, height);
-        return;
-      }
-      *(pixels + y * width + x) = pixel;
-      dirty = true;
-    }
-
-    void clear() {
-      for (Pixel *p = pixels; p < end(); p++) {
-        *p = {0, 0, 0};
-      }
-      dirty = true;
+      width(width), height(height),
+      pixelCount(width * height),
+      leds(pixelCount, GPIO_NUM_13) {
+      // nothing
     }
 
     void setup() {
-      // TODO init IO
+      leds.begin();
+      leds.setBrightness(8);
+      clear();
+    }
+
+    void set(uint8_t x, uint8_t y, uint8_t r, uint8_t g, uint8_t b) {
+      if (x >= width || y >= height) {
+        Serial.printf("ERROR: Cannot set pixel (%d/%d) in matrix (%d/%d).\n", x, y, width, height);
+        return;
+      }
+      leds.setPixelColor(y * width + x, r, g, b);
+    }
+
+    void clear() {
+      leds.clear();
     }
 
     void loop() {
-      if (!dirty) {
-        return;
-      }
-      dirty = false;
-      // TODO
+      leds.show();
     }
 
-    Pixel *begin() {
-      return pixels;
+    void setBrightness(int brightness) {
+      leds.setBrightness(min(255, max(0, brightness)));
     }
 
-    Pixel *end() {
-      return pixels + pixelCount;
+    int getBrightness() {
+      return leds.getBrightness();
     }
 
 };
diff --git a/src/display/Pixel.h b/src/display/Pixel.h
index 74949c4..b85b9be 100644
--- a/src/display/Pixel.h
+++ b/src/display/Pixel.h
@@ -13,6 +13,11 @@ public:
 
     uint8_t b;
 
+    Pixel(uint8_t r, uint8_t g, uint8_t b) :
+      r(r), g(g), b(b) {
+      // nothing
+    }
+
     bool isOn() const {
       return r != 0 || g != 0 || b != 0;
     }
@@ -23,6 +28,14 @@ public:
       b = brightness;
     }
 
+    uint32_t toInt() const {
+      return (((r << 8) | g) << 8) | b;
+    }
+
+    static Pixel gray(uint8_t brightness) {
+      return {brightness, brightness, brightness};
+    }
+
 };
 
 #endif
diff --git a/src/display/Vector.h b/src/display/Vector.h
new file mode 100644
index 0000000..26378a0
--- /dev/null
+++ b/src/display/Vector.h
@@ -0,0 +1,27 @@
+#ifndef POSITION_H
+#define POSITION_H
+
+#include "BASICS.h"
+
+class Vector {
+
+public:
+
+    double x;
+
+    double y;
+
+    Vector(double x, double y) :
+      x(x), y(y) {
+      // nothing
+    }
+
+    Vector(long degrees, double length) {
+      double radians = (double) degrees * DEG_TO_RAD;
+      x = cos(radians) * length;
+      y = sin(radians) * length;
+    }
+
+};
+
+#endif
diff --git a/src/main.cpp b/src/main.cpp
index f6fb655..831f177 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,12 +1,14 @@
 #include "mode/Mode.h"
 #include "mode/GameOfLife/GameOfLife.h"
 #include "display/Display.h"
+#include "mode/Pong/Pong.h"
+#include "mode/Test/Border.h"
 
 enum ModeId {
-    NONE, GAME_OF_LIFE
+    NONE, BORDER, GAME_OF_LIFE, PONG
 };
 
-Display display(8, 16);
+Display display(32, 8);
 
 ModeId newModeId = GAME_OF_LIFE;
 
@@ -24,18 +26,58 @@ void unloadOldMode();
 
 void loadNewMode();
 
+void setBrightness(int value);
+
 void setup() {
+  delay(500);
   Serial.begin(115200);
   Serial.println("\n\n\nStartup!\n");
   display.setup();
 }
 
+void setSpeed(double value);
+
+double speed = 1.0;
+
 void loop() {
+  if (Serial.available()) {
+    int input = Serial.read();
+    switch (input) {
+      case '0':
+      case '1':
+      case '2':
+      case '3':
+        newModeId = (ModeId) (input - '0');
+        break;
+      case '+':
+        setBrightness(display.getBrightness() + 10);
+        break;
+      case '-':
+        setBrightness(max(1, display.getBrightness() - 10));
+        break;
+      case ',':
+        setSpeed(speed / 1.1);
+        break;
+      case '.':
+        setSpeed(speed * 1.1);
+        break;
+    }
+  }
   checkMode();
   display.loop();
   stepMode();
 }
 
+void setBrightness(int value) {
+  display.setBrightness(value);
+  Serial.printf("Setting brightness to %5.1f%%\n", value / 2.55);
+}
+
+void setSpeed(double value) {
+  speed = min(1000.0, max(0.001, value));
+  Serial.printf("Setting speed to %6.2fx\n", value);
+}
+
 void checkMode() {
   if (currentModeId != newModeId) {
     unloadOldMode();
@@ -45,7 +87,6 @@ void checkMode() {
 
 void unloadOldMode() {
   if (mode != nullptr) {
-    Serial.printf("Unloading state \"%s\".\n", mode->getName());
     delete mode;
     mode = nullptr;
   }
@@ -55,15 +96,21 @@ void unloadOldMode() {
 void loadNewMode() {
   currentModeId = newModeId;
   lastMillis = 0;
-  Serial.printf("Loading state #%d.\n", currentModeId);
+  Serial.printf("Loading mode: #%d\n", currentModeId);
   switch (currentModeId) {
     case NONE:
       break;
+    case BORDER:
+      mode = new Border(&display);
+      break;
     case GAME_OF_LIFE:
       mode = new GameOfLife(&display);
       break;
+    case PONG:
+      mode = new Pong(&display);
+      break;
   }
-  Serial.printf("Loaded state \"%s\".\n", mode == nullptr ? "None" : mode->getName());
+  Serial.printf("Loaded mode: %s\n\n", mode == nullptr ? "None" : mode->getName());
 }
 
 void stepMode() {
@@ -73,5 +120,5 @@ void stepMode() {
   millis_t currentMillis = millis();
   millis_t dt = currentMillis - lastMillis;
   lastMillis = currentMillis;
-  mode->step(dt);
+  mode->step((millis_t) max(1.0, (double) dt * speed));
 }
diff --git a/src/mode/GameOfLife/Cell.h b/src/mode/GameOfLife/Cell.h
index 81a2baf..02cf011 100644
--- a/src/mode/GameOfLife/Cell.h
+++ b/src/mode/GameOfLife/Cell.h
@@ -21,10 +21,12 @@ public:
 
     void spawn() {
       state = GROWING;
+      value = 0;
     }
 
     void kill() {
       state = DYING;
+      value = 255;
     }
 
     void animate(uint8_t dt) {
@@ -49,6 +51,9 @@ public:
     }
 
     uint8_t getR() const {
+      if (state == ALIVE) {
+        return 255;
+      }
       if (state == DYING) {
         return value;
       }
@@ -56,6 +61,9 @@ public:
     }
 
     uint8_t getG() const {
+      if (state == ALIVE) {
+        return 255;
+      }
       if (state == GROWING) {
         return value;
       }
diff --git a/src/mode/GameOfLife/GameOfLife.h b/src/mode/GameOfLife/GameOfLife.h
index 2e4240c..ee50f2e 100644
--- a/src/mode/GameOfLife/GameOfLife.h
+++ b/src/mode/GameOfLife/GameOfLife.h
@@ -9,32 +9,37 @@ class GameOfLife : public Mode {
 
 private:
 
-    const uint8_t width;
-    const uint8_t height;
-    const uint16_t count;
+    millis_t runtime = 0;
+
+    uint8_t steps = 0;
 
     uint16_t aliveCount = 0;
 
-    millis_t runtime = 0;
-    uint8_t steps = 0;
+    uint16_t lastAliveCount = 0;
 
     Cell *cells;
+    Cell *last;
+
     Cell *next;
 
 public:
 
     explicit GameOfLife(Display *display) :
-      Mode(display, "Game of Life"),
-      width(display->getWidth()),
-      height(display->getHeight()),
-      count(display->getPixelCount()) {
-      cells = (Cell *) malloc(count * sizeof(Cell));
-      next = (Cell *) malloc(count * sizeof(Cell));
+      Mode(display, "Game of Life") {
+      cells = (Cell *) malloc(display->pixelCount * sizeof(Cell));
+      last = cells;
+      for (Cell *cell = cells; cell < cells + display->pixelCount; cell++) {
+        cell->state = DEAD;
+        cell->value = 0;
+      }
+      next = (Cell *) malloc(display->pixelCount * sizeof(Cell));
+      for (Cell *cell = next; cell < next + display->pixelCount; cell++) {
+        cell->state = DEAD;
+        cell->value = 0;
+      }
     }
 
-    ~GameOfLife()
-
-    override {
+    ~GameOfLife() override {
       if (cells != nullptr) {
         free(cells);
         cells = nullptr;
@@ -45,13 +50,13 @@ public:
       }
     }
 
-    void step(millis_t dt)
-
-    override {
+    void step(millis_t dt) override {
       runtime += dt;
-      while (runtime % 100 == 0) {
-        if (steps++ == 0 || aliveCount == 0) {
-          steps = 0;
+      if (runtime >= 500) {
+        runtime = 0;
+        bool isSteady = lastAliveCount == aliveCount;
+        lastAliveCount = aliveCount;
+        if (steps++ == 0 || aliveCount == 0 || isSteady) {
           randomFill();
         } else {
           nextGeneration();
@@ -63,7 +68,7 @@ public:
 private:
 
     void randomFill() {
-      for (Cell *cell = cells; cell < cells + count; cell++) {
+      for (Cell *cell = cells; cell < cells + display->pixelCount; cell++) {
         if (random(4) == 0) {
           if (!cell->isAlive()) {
             cell->spawn();
@@ -79,30 +84,48 @@ private:
     }
 
     void nextGeneration() {
-      for (int y = 0; y < height; y++) {
-        for (int x = 0; x < width; x++) {
-          Cell *cell = get(x, y);
+      memcpy(next, cells, display->pixelCount * sizeof(Cell));
+      Cell *src = cells;
+      Cell *dst = next;
+      for (int y = 0; y < display->height; y++) {
+        for (int x = 0; x < display->width; x++) {
           uint8_t around = countAround(x, y);
-          if (cell->isAlive()) {
+          if (src->isAlive()) {
             if (around <= 2 || 4 <= around) {
-              cell->kill();
+              dst->kill();
               aliveCount--;
             }
           } else if (around == 3) {
-            cell->spawn();
+            dst->spawn();
             aliveCount++;
           }
+          src++;
+          dst++;
         }
       }
-      memcpy(cells, next, count);
+      memcpy(cells, next, display->pixelCount * sizeof(Cell));
+    }
+
+    void print() {
+      Cell *cell = cells;
+      for (int y = 0; y < display->height; y++) {
+        Serial.print("|");
+        for (int x = 0; x < display->width; x++) {
+          Serial.print(cell->isAlive() ? "x|" : " |");
+          cell++;
+        }
+        Serial.println();
+        Serial.println();
+      }
     }
 
     void animate(millis_t dt) {
       Cell *cell = cells;
-      for (int y = 0; y < height; y++) {
-        for (int x = 0; x < width; x++) {
+      for (int y = 0; y < display->height; y++) {
+        for (int x = 0; x < display->width; x++) {
           cell->animate(dt);
-          display->set(x, y, {cell->getR(), cell->getG(), cell->getB()});
+          int xx = (y % 2) == 0 ? display->width - x - 1 : x;
+          display->set(xx, y, cell->getR(), cell->getG(), cell->getB());
           cell++;
         }
       }
@@ -110,21 +133,20 @@ private:
 
     uint8_t countAround(int x, int y) {
       return countIfAlive(x - 1, y - 1) + countIfAlive(x + 0, y - 1) + countIfAlive(x + 1, y - 1) +
-             countIfAlive(x - 1, y + 0) + countIfAlive(x + 0, y + 0) + countIfAlive(x + 1, y + 0) +
+             countIfAlive(x - 1, y + 0) + /*                              */ countIfAlive(x + 1, y + 0) +
              countIfAlive(x - 1, y + 1) + countIfAlive(x + 0, y + 1) + countIfAlive(x + 1, y + 1);
     }
 
     uint8_t countIfAlive(int x, int y) {
-      if (x < 0 || y < 0 || x >= width || y >= height) {
+      if (x < 0 || y < 0 || x >= display->width || y >= display->height) {
         return 0;
       }
       return get(x, y)->isAlive() ? 1 : 0;
     }
 
     Cell *get(int x, int y) {
-      return cells + width * y + x;
+      return cells + display->width * y + x;
     }
-
 };
 
 #endif
diff --git a/src/mode/Pong/Player.h b/src/mode/Pong/Player.h
new file mode 100644
index 0000000..778e0bd
--- /dev/null
+++ b/src/mode/Pong/Player.h
@@ -0,0 +1,16 @@
+#ifndef PLAYER_H
+#define PLAYER_H
+
+#include "BASICS.h"
+
+class Player {
+
+public:
+
+    int8_t position = 0;
+
+    uint8_t score = 0;
+
+};
+
+#endif
diff --git a/src/mode/Pong/Pong.h b/src/mode/Pong/Pong.h
new file mode 100644
index 0000000..c5d9bea
--- /dev/null
+++ b/src/mode/Pong/Pong.h
@@ -0,0 +1,41 @@
+#ifndef PONG_H
+#define PONG_H
+
+#include "mode/Mode.h"
+#include "Player.h"
+#include "display/Vector.h"
+
+class Pong : public Mode {
+
+private:
+
+    Player player0;
+
+    Player player1;
+
+    Vector position;
+
+    Vector velocity;
+
+public:
+
+    explicit Pong(Display *display) :
+      Mode(display, "Pong"),
+      position(display->width / 2.0, display->height / 2.0),
+      velocity(random(360), exp10(1)) {
+      // nothing
+    }
+
+    static int8_t randomSignum() {
+      return random(2) == 0 ? -1 : +1;
+    }
+
+    ~Pong() override = default;
+
+    void step(millis_t dt) override {
+
+    }
+
+};
+
+#endif
diff --git a/src/mode/Test/Border.h b/src/mode/Test/Border.h
new file mode 100644
index 0000000..1a3358c
--- /dev/null
+++ b/src/mode/Test/Border.h
@@ -0,0 +1,31 @@
+#ifndef TEST_H
+#define TEST_H
+
+#include "mode/Mode.h"
+
+class Border : public Mode {
+
+public:
+
+    explicit Border(Display *display) :
+      Mode(display, "Border") {
+      // nothing
+    }
+
+    ~Border() override = default;
+
+    void step(millis_t dt) override {
+      for (int y = 0; y < display->height; y++) {
+        for (int x = 0; x < display->width; x++) {
+          if (x == 0 || x == display->width - 1 || y == 0 || y == display->height - 1) {
+            display->set(x, y, 255, 255, 255);
+          } else {
+            display->set(x, y, 0, 0, 0);
+          }
+        }
+      }
+    }
+
+};
+
+#endif