A game tester (also known as a Quality Assurance, or QA tester) is responsible for testing video games before they are released to the public, to ensure that they are free of bugs, glitches, and other issues that could affect gameplay or the player experience. The primary duties of a game tester may include:

1. Playtesting the game: They play the game, identifying bugs, glitches, and other issues that could affect gameplay or the player experience.

2. Writing bug reports: They document the bugs and issues that they find in the game, providing detailed descriptions and instructions for reproducing the issue.

3. Reproducing bugs: They work to reproduce the bugs and issues that are reported by other testers or players, to ensure that they are real and not a one-time occurrence.

4. Regression testing: They test the game after bugs have been fixed or changes have been made, to ensure that the fixes or changes did not introduce new issues.

5. Performance testing: They test the game’s performance, including framerate, load times, and memory usage, to ensure that the game runs smoothly and optimally on a variety of platforms.

6. Multiplayer testing: They test the game’s multiplayer features, identifying any issues with connectivity, matchmaking, or other aspects of the multiplayer experience.

7. Providing feedback: They provide feedback to the game’s developers and designers, sharing their thoughts on gameplay, controls, difficulty, and other aspects of the game.

Overall, the goal of a game tester is to ensure that the game is free of bugs and issues, and that it provides a fun, engaging, and satisfying experience for players. By testing the game thoroughly and providing detailed feedback to the development team, game testers help to ensure that the game is of high quality and meets the expectations of players.