Become the manager of your own carnival. Build attractions, stalls and scenery. Hire staff and keep your guests happy :).
Your goal: build all available attractions. More instructions ingame... Build attractions: http://www.carnival-tycoon.com/help/attractions.html Build stalls: http://www.carnival-tycoon.com/help/stalls.html
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.