diff --git a/CM2005 Object Oriented Programming/Topic 2/2.5.13/MerkelMain.cpp b/CM2005 Object Oriented Programming/Topic 2/2.5.13/MerkelMain.cpp
new file mode 100644
index 0000000..3418d96
--- /dev/null
+++ b/CM2005 Object Oriented Programming/Topic 2/2.5.13/MerkelMain.cpp	
@@ -0,0 +1,135 @@
+#include "MerkelMain.h"
+#include <iostream>
+
+MerkelMain::MerkelMain()
+{
+  init();
+}
+
+void MerkelMain::init()
+{
+  loadOrderBook();
+  int input;
+  while(true)
+  {
+    printMenu();
+    input = getUserOption();
+    processUserOption(input);
+  }
+}
+
+void MerkelMain::loadOrderBook()
+{
+  orders.push_back( OrderBookEntry{
+                                    10000,
+                                    0.002,
+                                    "2020/03/17 17:01:24.884492",
+                                    "BTC/USDT",
+                                    OrderBookType::bid});
+
+  orders.push_back( OrderBookEntry{
+                                    50000,
+                                    0.002,
+                                    "2020/03/17 17:01:24.884492",
+                                    "BTC/USDT",
+                                   OrderBookType::bid});
+}
+
+void MerkelMain::printMenu()
+{
+  // 1 print help
+  std::cout << "1: Print help" << std::endl;
+  // 2 print exchange stats
+  std::cout << "2: Print exchange stats" << std::endl;
+  // 3 make an offer
+  std::cout << "3: Make an offer" << std::endl;
+  // 4 make a bid
+  std::cout << "4: Make a bid " << std::endl;
+  // 5 print wallet
+  std::cout << "5: Print wallet " << std::endl;
+  // 6 continue
+  std::cout << "6: Continue" << std::endl;
+
+  std::cout << "==========" << std::endl;
+  std::cout << "Enter an option: " << std::endl;
+}
+
+void MerkelMain::printHelp()
+{
+  std::cout << "Help - Your aim is to analyze the market, make bid and offers and make money." << std::endl;
+}
+
+void MerkelMain::printMarketStats()
+{
+  //std::cout << "Market looks good" << std::endl;
+  std::cout << "OrderBook contains " << orders.size() << " entries." << std::endl;
+  std::cout << orders[0].price << std::endl;
+  std::cout << orders[1].price << std::endl;
+}
+
+void MerkelMain::enterOffer()
+{
+  std::cout << "Make an offer - Enter the amount: " << std::endl;
+}
+
+void MerkelMain::enterBid()
+{
+  std::cout << "Make a bid - Enter the amount: " << std::endl;
+}
+
+void MerkelMain::printWallet()
+{
+  std::cout << "Your wallet is empty. " << std::endl;
+}
+
+void MerkelMain::goToNextTimeFrame()
+{
+  std::cout << "Going to next time frame. " << std::endl;
+}
+
+int MerkelMain::getUserOption()
+{
+  int userOption;
+  std::cin >> userOption;
+  std::cout << "You chose: " << userOption << std::endl;
+  return userOption;
+}
+
+void MerkelMain::processUserOption(int userOption)
+{
+  if (userOption == 0) // bad input
+  {
+    std::cout << "Invalid choice. Choose 1-6" << std::endl;
+  }
+
+  if (userOption == 1) // Option 1 - Help
+  {
+    printHelp();
+  }
+
+  if (userOption == 2) // Option 2 - Stats
+  {
+    printMarketStats();
+  }
+
+  if (userOption == 3) // Option 3 - Offer
+  {
+    enterOffer();
+  }
+
+  if (userOption == 4) // Option 4 - Bid
+  {
+    enterBid();
+  }
+
+  if (userOption == 5) // Option 5 - Wallet
+  {
+    printWallet();
+  }
+
+  if (userOption == 6) // bad input
+  {
+    goToNextTimeFrame();
+  }
+  return;
+}
\ No newline at end of file
diff --git a/CM2005 Object Oriented Programming/Topic 2/2.5.13/MerkelMain.h b/CM2005 Object Oriented Programming/Topic 2/2.5.13/MerkelMain.h
new file mode 100644
index 0000000..995d53a
--- /dev/null
+++ b/CM2005 Object Oriented Programming/Topic 2/2.5.13/MerkelMain.h	
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <vector>
+#include "OrderBookEntry.h"
+
+class MerkelMain
+{
+  public:
+    MerkelMain();
+  private:
+  /* Starts the sim */
+    void init();
+    void loadOrderBook();
+    void printMenu();
+    void printHelp();
+    void printMarketStats();
+    void enterOffer();
+    void enterBid();
+    void printWallet();
+    void goToNextTimeFrame();
+    int getUserOption();
+    void processUserOption(int userOption);
+    std::vector<OrderBookEntry> orders;
+};
\ No newline at end of file
diff --git a/CM2005 Object Oriented Programming/Topic 2/2.5.13/OrderBookEntry.cpp b/CM2005 Object Oriented Programming/Topic 2/2.5.13/OrderBookEntry.cpp
new file mode 100644
index 0000000..d2f3f0e
--- /dev/null
+++ b/CM2005 Object Oriented Programming/Topic 2/2.5.13/OrderBookEntry.cpp	
@@ -0,0 +1,18 @@
+#include "OrderBookEntry.h"
+
+OrderBookEntry::OrderBookEntry
+(
+  double price,
+  double amount,
+  std::string timestamp,
+  std::string product,
+  OrderBookType orderType
+)
+:
+price{price},
+amount{amount},
+timestamp{timestamp},
+product{product},
+orderType{orderType}
+{
+}
\ No newline at end of file
diff --git a/CM2005 Object Oriented Programming/Topic 2/2.5.13/OrderBookEntry.h b/CM2005 Object Oriented Programming/Topic 2/2.5.13/OrderBookEntry.h
new file mode 100644
index 0000000..60bfe3c
--- /dev/null
+++ b/CM2005 Object Oriented Programming/Topic 2/2.5.13/OrderBookEntry.h	
@@ -0,0 +1,26 @@
+#pragma once
+#include <string>
+
+enum class OrderBookType
+{
+  bid,
+  ask
+};
+
+class OrderBookEntry
+{
+  public:
+    OrderBookEntry
+    (
+      double price,
+      double amount,
+      std::string timestamp,
+      std::string product,
+      OrderBookType orderType
+    );
+    double price;
+    double amount;
+    std::string timestamp;
+    std::string product;
+    OrderBookType orderType;
+};
\ No newline at end of file
diff --git a/CM2005 Object Oriented Programming/Topic 2/2.5.13/a.exe b/CM2005 Object Oriented Programming/Topic 2/2.5.13/a.exe
new file mode 100644
index 0000000..706af88
Binary files /dev/null and b/CM2005 Object Oriented Programming/Topic 2/2.5.13/a.exe differ
diff --git a/CM2005 Object Oriented Programming/Topic 2/2.5.13/main.cpp b/CM2005 Object Oriented Programming/Topic 2/2.5.13/main.cpp
new file mode 100644
index 0000000..b6b2991
--- /dev/null
+++ b/CM2005 Object Oriented Programming/Topic 2/2.5.13/main.cpp	
@@ -0,0 +1,10 @@
+#include <iostream>
+#include <string>
+#include <vector>
+#include "OrderBookEntry.h"
+#include "MerkelMain.h"
+
+int main()
+{
+  MerkelMain app{};
+}
\ No newline at end of file