What should be done when a terminal application does not recognise some keyboard inputs?

I'm trying to play a very old [Star Trek BSD game](https://manpages.debian.org/unstable/bsdgames/trek.6.en.html) . It recognises characters that I type, but I occasionally make an error and want to use the arrow keys to correct it. This always fails. The pressing the left arrow on my keyboard makes me type ^[[D and the other arrow keys are similar. I believe that many old packages behave like this. What are the idiomatic solutions to this problem? Are them some old-school keyboard shortcuts that I have not thought to try? Or must I resort to manually modifying the game myself? It certainly seems to not expect Vi movements.