Most commercial computer and video games are written primarily in C++, C, and some assembly language. Many games, especially those with complex interactive gameplay mechanics, tax hardware to its limit. As such, highly optimized code is required for these games to run at an acceptable frame rate. Because of this, compiled code is typically used for performance-critical components, such as visual rendering and physics calculations. Almost all PC games also use either the DirectX, OpenGL APIs or some wrapper library to interface with hardware devices.