I think there was one puzzle in this game that required tapping. Plus a couple that required other sorts of non-obvious mouse interaction. That was about it.
I do like the ability to find out what each material is by listening to it when you tap it, though.
A tad more "on-topic"...
Revelation has some really impressive graphics and environments, a better, more cohesive story than the other games in the series, and a few really tough (but mostly fair) puzzles. The music varied but was pretty good overall, the production values were high, and there were a lot of special little touches applied, like the camera and the amulet, that make it a really fun game to play through.
But there were a few minor quibbles that bugged me.
1. Revelation had only 4 small worlds to explore, and despite the tough puzzles, the game seemed kind of short.
2. The timed puzzles ranged from good to annoying. It's unbelievable the number of times I'd completely solved a puzzle, only to get stymied by the timed element of it.
3. The puzzles were uneven. Whereas the puzzles in Riven got progressively harder and built on previously learned information, the puzzles in Revelation were all over the map. Some were so easy they were barely puzzles. Many others were just more complex versions of a previously solved puzzle. And one or two were quite difficult. There were only a few, though, that had that "Aha!" element to them from the earlier Myst games--the part where you look at a puzzle and see everything upside-down and backwards, and suddenly things begin to click into place.
4. The endgame. Avoiding spoilers, I rather liked the ending as far as story goes. The final puzzles and the environment in which they were solved, though--those were silly. The scene/puzzles reminded me of inanity that was the Lost Mind of Dr. Brain...and that's not a good thing.
5. I'm docking points for the 5 minute winamp visualization late in the game...and I'm half inclined to ask if the animators just ran out of money.
6. For some reason, the wait to access the main menu/submenus got longer as the game wore on. Eventually I got up to around a minute and a half loading time every time I pressed "Esc", another minute every time I clicked on "Save Game", and another minute every time I entered a save name and clicked the save button. Not sure why that happened, but it became a habit to get up and go to get a snack or read a book or go on a vacation while I waited...Oddly, the game itself ran fine.
7. It was often hard to determine when you were finished with something and could move on. Especially after completing the final puzzle in each world. Rides are nice, but even a Final Fantasy victory fanfare would have been welcome.
8. Can we stop with the fading in and out already? If you're going to go for dvds and full motion video, then USE them.
None of those were game-killing flaws though, and few games I've played this year were so enjoyable.
Don't even ask what my non-mini review would look like, I don't want to think about it.