This is a game for 2 players, played in a court surrounded by four walls, using rackets and a small rubber ball.
Squash.
What are they playing?
They're playing table tennis / ping-pong.
This is a game played by 2 teams of people swimming in a swimming pool. Players try to throw a ball into the other team’s goal.
Water polo.
This is a game in which teams of players form circles and try to hit other teams with a large ball.
Dodgeball.
What is he playing?
He's playing soccer / football.
What is he playing?
He's playing golf.
This is a sport in Southeast Asia. Players can only use their feet, knee, chest and head to touch the ball.
Sepak takraw / kick volleyball.
What are they playing?
They're playing volleyball.
Which sport is this?
It's (American) football.
Which game is this?
It's bowling.
Which game is this?
It's billiards.
Which sport is this?
It's tennis.
Which sport is this?
It's basketball.
Which sport is this?
It's baseball.
What are they playing?
They're playing badminton.
What are they playing?
They're playing (ice) hockey.
Which game is this?
It's table football / table soccer / foosball.