I still haven't been able to find a YouTube sample that shows the point-and-click type option for movement. Hopefully by the time the game shows up at GOG there will be one.

I remember playing the original RealMyst and somehow getting waist-deep in the ground in the Selenitic Age. I had to click on the door controls to get the close-up and then exit back out of the close-up to get back to the normal level. So falling through the ground isn't limited to the new edition.

Plumgas, How does one qualify for a discount on GOG games? I buy many games via GOG.
Sandy

real myst gives more roaming movement on the island , where masterpiece you can only travel in a set path. I had the disk version of masterpiece but then purchased real myst from gog

here is a better explanation from a post back in 2006

Myst
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The game was originally released in 1993 (on CD's) and is therefore somewhat primitive by today's standards. It uses a "point/click/go there" navigation system, in which you interact with the game through a series of static, pre-rendered images (although you can look around within an image) to solve puzzles and advance in the game. The "point/click/go there" navigation system means that it's not a real-time graphics game like Myst V, in that you move from place to place on a zap-to-a-new-location basis instead of walking to the new location in real time.

realMyst
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It's essentially the same game - the puzzles are the same and the Linking Books are the same, and it's still on CD's - but there's an additional Age called Rime. The primary attraction of this release is a new 3D engine, with real-time graphics, freedom of movement, and relatively dynamic environments, much like Myst V. The benefits of the new engine are limited to the visuals, however, and the downside is that on some PC's, the engine runs slowly and causes the game to drag.

Myst Masterpiece Edition
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This release is a remastering of the original game, with 24-bit color graphics, 16-bit sound, and full compatibility with Windows XP. The music has been digitally remastered and new sound effects added. Color is much better than the original, and the movies and animations are larger and higher-quality. A DigitalGuide in-game help system has been added, with the level of help ranging from broad hints to specific solutions. Also included is Myst: The Book of Atrus, a prequel written by Myst designers Rand and Robyn Miller, which explains the background underlying the Myst world. The original "point/click/go there" navigation is still used, however. Myst Masterpiece Edition is part of the Myst 10th Anniversary DVD Edition, which also contains Riven: Sequel to Myst and Myst III: Exile.

IMHO, your best value is the Myst 10th Anniversary DVD Edition, since you also get Riven and Exile. But if you want real-time animation and don't want "point/click/go there" navigation, your only choice is realMyst. It's currently available on eBay, Amazon, et al.