Rollercoaster Tycoon 4 on mobile adopts free-to-play mechanics, where the wait for new rides and attractions to be built can be expedited by spending in-game currency.

Despite this, it will be sold as a premium download, with Chien assuring players that otherwise all content can be purchased without having to invest additional funds.

"The game will come pre-loaded with over $5 of in-game currency, with the value of in-game currency you're getting more than what you paid for," he said.

While certain elements of the original games remain - such as players being able to build their own rollercoasters and using the thought bubbles of park attendees as feedback - it will drop the campaign structure for a single, persistent park that exists in real time.

It will, however, retain the isometric, tile-based visual approach of the first two games in the series, with Atari and Lithuanian developer On5 working closely with original creator Chris Sawyer for a "consistent vision".

Meanwhile, new social features include Game Centre leaderboards and Facebook sharing of rollercoaster blueprints with friends.

While specific differences between the mobile and PC versions - such as whether it adopts the same structure and use of in-game currency - have yet to be confirmed, it will be an "online multiplayer experience" that won't run through Facebook.