Machine Code

Machine code and Assembly Language refer to the low-level code which is direcly executed by a CPU. This is in contrast to programming languages like C, C++, Go and Rust which are considered "high-level" and must compile the code into the low-level format.

Early adventure games were coded using machine code since high-level compilers for the 8-bit computers of the time either did not exist, or produced code which was too large or ran too slowly.