In all of our Gym games, after submitting an answer, you can click the Compare icon in the bottom-right corner of the game panel (or alternatively use the 'C' key on your computer's keyboard).
This will enter you into Compare mode which in all games will pause the game in order for you to analyze your given answer and compare it to the correct answer.
Some specific games offer additional comparing features such as playing back each answer option.
After you're done comparing, simply press the button again or the 'C' key on your keyboard) to resume the game.