National Geographic games appear to have little connection to curriculum. Please let me know if you find some of relevance.
Pluto's Secret has some content (minor facts about the planets). Play is along the lines of the old Duke Nuke Em. Most of it's about the game play. It might have been interesting to show different gravities on each planet. It does try to cover up why things that shouldn't work do: Our intrepid heroes walk on Jupiter: "How can we walk on gas?" "It's our special mystery boots."