OpenRCT2 is a game add-on designed to add new features, fix bugs, raise game limits and add multiplayer co-op to Rollercoaster Tycoon 2. The original game needs to be installed.

According to the developer, there are ways to play it free of charge at this page.

OpenRCT2 Features:

● Intro sequence does not show by default.
● New title screen logo.
● New title sequence (RCT2 version also still available).
● Title sequence music can now be disabled or changed to the RollerCoaster Tycoon 1 theme music.
● In-game console.
● Improved settings window with tab interface.
● Ability to change language while in game.
● Text input is now an in-game window.
● Toggle between software and hardware video mode.
● Toggle between a resizable window and full screen.
● Windows now snap to the borders of other windows when dragging (snap radius configurable).
● Interface colour themes. (Presets for RCT1 and RCT2 are included by default).
● Re-introduce traffic lights for close / test / open as a theme option.
● Show day as well as the month and year.
● Show month before day (e.g., March 14th, year 15)
● Exit OpenRCT2 to the desktop.
● Game configuration, cache, scores, and screenshots now saved in the user documents directory under OpenRCT2.
● Auto-saving with frequency option.
● Many, many more....