Gameplay modes refer to different ways in which a game can be played or experienced. These modes are typically pre-defined scenarios, challenges or objectives that players must complete within the confines of the game's rules and mechanics. Gameplay modes can vary from single player campaigns where players control one character through an adventure, to multiplayer modes where multiple players compete against each other in various ways, such as deathmatch or capture-the-flag. Some games also offer sandbox mode which allows for more open ended gameplay and exploration of the virtual world without any specific objectives or constraints. The variety of gameplay modes available can add replayability to a game by offering new challenges and experiences with each playthrough, keeping players engaged and entertained over time.