Hidden Expedition: Everest Download PC

Hidden Expedition: Everest was released on June 1, 2007. As a member of the Hidden Expedition Club, the player is trying to reach the top of Mt. Everest ahead of three competing expedition clubs. But first the player must find a mysterious adventurer who can help them find a hidden passage up. This leads the player through a variety of locations in Latin America, Europe, and Asia before ending at Mt. Everest.

The game features a likeness of world-famous mountaineer and Mt. Everest climber, Ed Viesturs as an assistant who provides players with guidance on various locations. Viesturs was involved in the actual development of the game, along with National Geographic Ventures, which worked with Big Fish Games to incorporate some of "National Geographic's rich repository of video, photos, stories and other editorial from previous Everest expeditions and from National Geographic's incredible collection of exploration and adventure content" into the game play.

An iOS version was released on May 14, 2009. This marked Big Fish Game's first foray into making games targeted at the then emerging iPhone market. Lead Artist Shawn Wood and Lead Programmer Tyson Chihaya were given the job of remaking the game for the iOS platform. Due to the series popularity and it being Big Fish's first iPhone game, Woods noted they "felt a bit of pressure to get it right." The team started by first playing through the PC version to determine what elements would need to be changed due to the differences in PC gaming and the iPhone, as well as to see what improvements could be made. They then had to deconstruct the original code and rewrite it, as the PC games were made with Adobe Flash and Adobe Director, while the iOS game would need to be written in Objective-C.

The significantly smaller screen of an iPhone resulted in the team having to redesign the buttons and hidden object scenes. Many of the original objects were too small to find once the pictures were rescaled to the 320x480 size, resulting in the scenes and some mini-games having to be changed. The team also leveraged the iPhone touch controls and zooming capabilities to render the scenes into a usable form.

According to Big Fish, upon release the game quickly rose to the top of the iPhone sales charts and was rated 4 out of 5 stars by users. With the success of this game, Big Fish was committed to continuing to release games for the iPhone and iOS.