How to play a multiplayer game on Android using Google Play
It depends upon the game is LAN Wi-fi or online multiplayer.
If it is online multiplayer, you can play by simply connecting to internet.
And if its LAN Wi-fi than you have to connect you opponent's wi-fi and opponent can do the same and yes you are connected to play with your opponent.
Some of the Online multiplayer games available on Google Play Store:
•Clash Royale
Clash Royale - Android Apps on Google Play
•8 Ball Pool
8 Ball Pool - Android Apps on Google Play
•Modern Combat 5
Modern Combat 5: eSports FPS - Android Apps on Google Play
• Uno and Friends
UNO ™ & Friends - Android Apps on Google Play
•Ludo Bing
Ludo Bing - Android Apps on Google Play
Some of the LAN Wi-fi games available on Play Store:
•Bombsquad
BombSquad - Android Apps on Google Play
•Sea Battle
Sea Battle - Android Apps on Google Play
•Mini Militia
Doodle Army 2 : Mini Militia - Android Apps on Google Play
•Real Steel
Real Steel World Robot Boxing - Android Apps on Google Play
•DUAL
DUAL! - Android Apps on Google Play
Hope you find my answer helpful and dont forget to upvote!