| I already have a game on google play, but I will upgrade and I want to use achievements and leaderboards.|
I got from there:
<?xml version="1.0" encoding="utf-8"?>
Google Play game services IDs.
Save this file as res/values/games-ids.xml in your project.
How do I put this code on monkey?
Where do I put the app ID on the monkey file?
How do I use the code (those strings) to link with the score of app?
this link could help: https://developers.google.com/games/services/android/quickstart#step_3_modify_your_code