Easy. Easy easy easy. Atlantis II, or "Beyond Atlantis", an old point-and-click adventure game made by Cryo Interactive while they were buried in cocaine.
You play an amnesiac young man (standard) who watches a boat fall from the sky (...) and then finds out that he's actually the chosen one (-__-) and is destined to unlock Atlantis (?) but first must retrieve stones by having his spirit flung into a Mayan warrior under dying king (???), a Chinese scholar trapped in a monastery by a demon (?????) and an Irish monk at a monastery on a set of islands under assault by the Old Celtic Gods (???!!??!!!???!???)
In the Mayan section, you must save your crops and curry the gods' favor before your enemies attack and before your king kills himself with sacrifices (;___

. To do this, you have to ingest a burning dust that sends you to the spirit realm without killing you (??) and hunt down the sleeping God and wake him up. To get the "information" needed to do this from the Frog God, you have to solve/cheat several puzzles involving dancing around a spiderweb with a giant spider chasing you in first person (?????), and then find all the stars laying on the ground in one section to complete a constellation on a rock which summons the relevant god. (?!?!?) Your gift for doing this: The rock.
In the Chinese section, you have to walk an abstract pathway in a sacred room of the monastery to access a map room. You can fall into the map, manipulating this to talk to various dolls that speak in riddles (??????) that allow you to cross a bridge. You then fly across the map and find the exorcist who requires you to retrieve a permit from Hell (????????????????????????????????????????????????????????????????????????????). It turns out that Hell is a bureaucracy, and the puzzle involves navigating the bureaucracy (complete with ceiling walking as the souls of the Damned whiz around, having gone entirely insane). Once you get the permit, you can exorcise the demon and find the rock.
The Irish section...
The...
The Iri...
...
The Irish section requires you to reconstruct the skull of a dead king from pieces around the island (?????????????????) with no hints (-____-) and then finding a druid stick and smacking a rock so hard that a horse falls out (??????????????????????????????????????????????????) and then riding the horse across the ocean (???????????????????????????????????????????????????????????????????????????) to an island populated by a single man who mistakes himself to be a blackbird (????????????????????????) who gives you a divining stick that explodes a well out of the ground (??????????????????????????????????????) so you can recapture a relic that you need to allow the blacksmith in the book you were illustrating (which you can fall into) (????????????) so you can rearm (literally) the king so that he can lead his people again. Other tasks include outwitting an ancient goddess so that she reverses a curse that turned a woman (in the book again) to stone, so you can give her a salmon (??????????) which she makes into an amulet (?). The stone just... kind of appears at the end.
Then, you wander around baffled for a bit before you divine that each section had a spot that you needed to activate your Chekov's Crystal Globe at, so you go back and do that. Doing so
flings you into space (I broke my question mark key) for no adequate reason.
Finally, you gain access to Shambhala, and are promptly thrown through "off" versions of your previous locations where you pick up random objects from random locations with random NPCs spouting random lines before going underwater to Atlantis where you kill a giant octopus and then the earth is cleansed and you become Adam with a random naked girl added in to be Eve.
Please translate the above paragraph, if you can. I wrote it, but I don't understand it.
I highly recommend playing it with a walkthrough, it's an experience unparalleled by any other medium.