A day/night cycle changes the demographics of the park's peeps rides at night appeal to teenagers, while the daytime attracts families with children. Unlike the two previous versions of the game, RollerCoaster Tycoon and RollerCoaster Tycoon 2, the guests, called "peeps", arrive in groups and show variation in gender and age, including children, teenagers and adults. RollerCoaster Tycoon 3 includes new gameplay features such as the CoasterCam, which allows players to "ride" roller coasters and other rides, and the MixMaster, which allows the player to coordinate firework shows and time them to in-game music. Players are given a large, empty plot of land and unlimited funds with which to build their own custom parks. The second mode of play is the sandbox mode. A third of the scenarios are playable from the start, with the rest unlocked when the player completes the objectives at each level. Each scenario has three levels of objectives, which are ranked as Apprentice, Entrepreneur, and Tycoon the higher the level, the more challenging the goal is to complete. The career mode features scenarios where players must accomplish goals, such as impressing a visiting celebrity or attaining a certain park rating. RollerCoaster Tycoon features two main game modes. Like the previous games in the series, RollerCoaster Tycoon 3 is a strategy and simulation game in which players manage all aspects of an amusement park by building or removing rides, scenery and amenities, adjusting the park's finances, hiring staff, and keeping the park visitors, known as "peeps", happy.