What language would you use for making a game on different platforms?

Question

I would like to know which programming language would best suit each game:
1. an MMO .io game
2. a downloadable program from the internet on computer
3. a disk inserted in a computer
4. as a disk inserted in a console
5. an app on the Google Play store or such

Answer 1

java: for apps
js: for MMO
c++/c# : for others

Answer 2

I would use Go(or D) for Android.

Answer 3

unity its present on nearly every platform