Joy is a number game that combines speed and precision. In each round, a math problem appears involving addition, subtraction, or multiplication. Four answer options are presented for each task.
A round includes 10 questions and lasts 60 seconds. Each correct answer gives 10 points. The final score depends on the number of correct solutions within the time limit.
After the round ends, a results screen is displayed. The achieved score is automatically saved in a local leaderboard. The leaderboard stores the five highest results on the device.
The round ends when all questions are answered or when the time expires. The gameplay blends puzzle elements with mental calculation in a structured and time-based format.