diff --git a/terminal/puzzle_leftRight/.gitignore b/terminal/puzzle_leftRight/.gitignore
new file mode 100644
index 0000000..89cc49c
--- /dev/null
+++ b/terminal/puzzle_leftRight/.gitignore
@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
diff --git a/terminal/puzzle_leftRight/platformio.ini b/terminal/puzzle_leftRight/platformio.ini
new file mode 100644
index 0000000..d5fd72a
--- /dev/null
+++ b/terminal/puzzle_leftRight/platformio.ini
@@ -0,0 +1,15 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nanoatmega328new]
+platform = atmelavr
+board = nanoatmega328new
+framework = arduino
+lib_deps = adafruit/Adafruit NeoPixel@^1.15.2
diff --git a/terminal/puzzle_leftRight/src/main.cpp b/terminal/puzzle_leftRight/src/main.cpp
new file mode 100644
index 0000000..1337f8e
--- /dev/null
+++ b/terminal/puzzle_leftRight/src/main.cpp
@@ -0,0 +1,155 @@
+#include <Arduino.h>
+#include <Adafruit_NeoPixel.h>
+
+/*
+Slave Modul 1
+- Taster an A0 und A1 (INPUT_PULLUP)
+- 16 Neopixel an D4
+- D3 -> Master
+    LOW  = nicht gelöst
+    HIGH = gelöst (bleibt HIGH)
+- D2 -> Master
+    HIGH = neue Sequenz generieren
+*/
+
+#define LED_PIN       4
+#define NUM_LEDS      16
+
+#define POWER_PIN 12
+bool powerOnState = true;
+
+#define BUTTON1_PIN   A0
+#define BUTTON2_PIN   A1
+#define austausch_master_pin    3
+#define randomizer_master_pin    2
+
+Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_RGB + NEO_KHZ800);
+
+int sequence[NUM_LEDS];
+int currentStep = 0;
+bool gameWon = false;
+
+int lastButton1State = HIGH;
+int lastButton2State = HIGH;
+
+int ledIndex(int logical) {
+  return (NUM_LEDS - 1) - logical;
+}
+
+void generateNewSequence() {
+  for (int i = 0; i < NUM_LEDS; i++) {
+    sequence[i] = random(0, 2);
+  }
+}
+
+void setAll(uint32_t color) {
+  for (int i = 0; i < NUM_LEDS; i++) {
+    strip.setPixelColor(i, color);
+  }
+}
+
+void resetGame() {
+  setAll(strip.Color(0, 0, 0));
+  strip.show();
+  currentStep = 0;
+  gameWon = false;
+  digitalWrite(austausch_master_pin, LOW);
+}
+
+void winAnimation() {
+  strip.show();
+  delay(250);
+
+  setAll(strip.Color(0, 0, 0));
+  strip.show();
+  delay(250);
+
+  uint8_t w = 50;
+  for (int i = 0; i < NUM_LEDS; i++) {
+    strip.setPixelColor(
+      ledIndex(i),
+      strip.Color(0, 0, w)
+    );
+    strip.show();
+    delay(20);
+  }
+
+  setAll(strip.Color(0, 0, w));
+  strip.show();
+}
+
+void checkPress(int buttonID) {
+  if (buttonID == sequence[currentStep]) {
+    strip.setPixelColor(
+      ledIndex(currentStep),
+      strip.Color(0, 0, 40)
+    );
+    strip.show();
+    currentStep++;
+
+    if (currentStep >= NUM_LEDS) {
+      winAnimation();
+      gameWon = true;
+      digitalWrite(austausch_master_pin, HIGH);
+    }
+  } else {
+    resetGame();
+  }
+}
+
+void setup() {
+  pinMode(BUTTON1_PIN, INPUT_PULLUP);
+  pinMode(BUTTON2_PIN, INPUT_PULLUP);
+  pinMode(POWER_PIN, INPUT_PULLUP);
+  powerOnState = digitalRead(POWER_PIN) == HIGH;
+  pinMode(austausch_master_pin, OUTPUT);
+  pinMode(randomizer_master_pin, INPUT_PULLUP);
+
+  digitalWrite(austausch_master_pin, LOW);
+
+  strip.begin();
+  strip.show();
+
+  randomSeed(millis());
+  generateNewSequence();
+  resetGame();
+}
+
+void loop() {
+  //Detecting turn-off
+  if (powerOnState && digitalRead(POWER_PIN) == LOW) {
+    powerOnState = false;
+    resetGame();
+  }
+  //Detecting turn-on
+  if (!powerOnState && digitalRead(POWER_PIN) == HIGH) {
+    powerOnState = true;
+  }
+  if (!powerOnState) {
+    //We are turned-off and stop anything after here
+    return;
+  }
+  // Master-D2 HIGH → neue Sequenz
+  if (digitalRead(randomizer_master_pin) == HIGH) {
+    generateNewSequence();
+    resetGame();
+    delay(50);  // Puls kurz blockieren
+  }
+
+  int currentButton1State = digitalRead(BUTTON1_PIN);
+  int currentButton2State = digitalRead(BUTTON2_PIN);
+
+  if (!gameWon) {
+    if (lastButton1State == HIGH && currentButton1State == LOW) {
+      checkPress(0);
+      delay(200);
+    }
+    if (lastButton2State == HIGH && currentButton2State == LOW) {
+      checkPress(1);
+      delay(200);
+    }
+  }
+
+  lastButton1State = currentButton1State;
+  lastButton2State = currentButton2State;
+}
\ No newline at end of file