City of Six Moons is an alien civilization game in both senses: a solitaire game in which the player guides the destiny of an alien civilization, and a game from an alien civilization.
Inside the box you will find the components needed to play the game, and a rulebook written entirely in symbols and icons. You will need to decipher the game's rules yourself. You will never know whether you've gotten it right or not. No mechanisms are listed on this page. The designer will never answer any rules questions.
Note: Hollandspiele generally sells direct, not through distributors. But they don't ship to Europe; the only known source to buy Hollandspiele games in Europe is from Second Chance Games in UK. For Canada, see this thread. Australia and other countries don't have local resellers, so you have to order from abroad.