How can coder make a game playble on Emulator

[prokit]

Just like the title say.
How can you guys - the coders make a game playble on the Emulator ?
If a game is unplayble, is it because of the missing features that you guys haven't been able to implement or because of the coding itself doesn't work with those games yet ?

[ssshadow]

Both

[prokit]

Both

Thank you for your answer.