diff --git a/ryanlau/lab1_hard_project/CMakeLists.txt b/ryanlau/lab1_hard_project/CMakeLists.txt
new file mode 100644
index 0000000..76eab66
--- /dev/null
+++ b/ryanlau/lab1_hard_project/CMakeLists.txt
@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.15...3.30)
+
+project(
+  HW1_PART2
+  VERSION 1.0
+  LANGUAGES CXX)
+
+add_library(HelloWorldLib src/hello_world.cpp)
+target_include_directories(HelloWorldLib PUBLIC include)
+
+add_executable(HelloWorld src/main.cpp)
+
+target_link_libraries(HelloWorld PRIVATE HelloWorldLib)
diff --git a/ryanlau/lab1_hard_project/include/hello_world.h b/ryanlau/lab1_hard_project/include/hello_world.h
new file mode 100644
index 0000000..97bab6d
--- /dev/null
+++ b/ryanlau/lab1_hard_project/include/hello_world.h
@@ -0,0 +1,9 @@
+#ifndef HELLOWORLD_H
+#define HELLOWORLD_H
+
+class HelloWorld {
+  public:
+    void hello();
+};
+
+#endif
diff --git a/ryanlau/lab1_hard_project/src/hello_world.cpp b/ryanlau/lab1_hard_project/src/hello_world.cpp
new file mode 100644
index 0000000..56b51c3
--- /dev/null
+++ b/ryanlau/lab1_hard_project/src/hello_world.cpp
@@ -0,0 +1,6 @@
+#include "hello_world.h"
+#include <iostream>
+
+void HelloWorld::hello() {
+  std::cout << "Hello, World!\n";
+}
diff --git a/ryanlau/lab1_hard_project/src/main.cpp b/ryanlau/lab1_hard_project/src/main.cpp
new file mode 100644
index 0000000..eecd6c8
--- /dev/null
+++ b/ryanlau/lab1_hard_project/src/main.cpp
@@ -0,0 +1,7 @@
+#include "hello_world.h"
+
+int main() {
+  HelloWorld h;
+  h.hello();
+  return 0;
+}
diff --git a/ryanlau/lab1_medium_project/CMakeLists.txt b/ryanlau/lab1_medium_project/CMakeLists.txt
new file mode 100644
index 0000000..386fa8e
--- /dev/null
+++ b/ryanlau/lab1_medium_project/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.15...3.30)
+
+project(
+  HW1_PART1
+  VERSION 1.0
+  LANGUAGES CXX)
+
+add_executable(HelloWorld src/main.cpp)
diff --git a/ryanlau/lab1_medium_project/src/main.cpp b/ryanlau/lab1_medium_project/src/main.cpp
new file mode 100644
index 0000000..a84136b
--- /dev/null
+++ b/ryanlau/lab1_medium_project/src/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main()
+{
+     std::cout << "Hello, World!\n";
+}