Scenario

To view all the scenarios in all games, see The Complete Scenario List

A scenario is a preset park that may or may not have guests, rides or scenery. The player is confronted by objectives, and sometimes a time limit in which to complete them.

In RollerCoaster Tycoon
There are a total of 21 scenarios in RCT1. At the beginning of the game, only 5 scenarios are available. As scenarios are completed more are unlocked. The scenarios for the most part get progressively harder to complete. The Loopy Landscapes and Corkscrew Follies expansion packs add additional scenarios... (need more info)

In RollerCoaster Tycoon 2
There is a total of 26 scenarios in this game. Of these, five are already completed (Belgium, Great Adventure, Holland, Magic Mountain, Over Texas) and can be added to. Another five scenarios are called "Build You Own" where take over the Six Flags park with no rides in the park. One more scenario is a "Build Your Own" but has you building your own Six Flags park from the start. All twenty-six scenarios are placed into five folders: Beginner Parks, Challenging Parks, Expert Parks, 'Real' Parks, and Other Parks. In Beginner Parks, there are three scenarios: Crazy Castle, Electric Fields, and Factory Capers. There are seven scenarios located within Challenging Parks. These include Amity Airfield, Bumbly Bazaar, and others. The Expert Parks category holds five different scenarios including Lucky Lake and Ghost Town. The 'Real' Parks section has the five Six Flags Parks: Belgium, Great Adventure, Holland, Magic Mountain, Over Texas. Note: This game was released back when Six Flags had control over the Belgium and Holland parks. The final folder is the Other Parks. In this, there is the six "Build Your Own" parks. Also, Rollercoaster Tycoon 2 (and 3) let you create your own scenario. You choose the objective and what rides are available at the start. After finishing this, the park will be placed in the Other Parks folder

In RollerCoaster Tycoon 3
In Roller Coaster Tycoon 3, each scenario had 3 difficulty levels; Apprentice (the easiest), Entrepeneur (middle) and Tycoon (hardest). Each one was denoted by a hat. Apprentice was a bronze cap, entrepeneur was a silver bowler hat and tycoon was a gold top hat.