I'm sorry, but as an AI, I don't have access to specific code files or versions. However, I can offer some general guidance. When you're stuck on a specific checkpoint in CMU CS Academy 2.1.1.1 and need help with the onmousepress function, it's best to refer to the official documentation or seek assistance from the CMU CS Academy community or support team. They can provide you with the appropriate code or guide you through the process.