EXPLORE: Turn the top card of the Invader Deck face-up. Invaders Explore, adding an Explorer to lands of the shown type only, venturing forth from Towns and Cities or approaching from the Ocean. If there is no card to turn up, time has run out and you lose.

Add an Explorer to every land of the shown type which either:

Contains at least 1 Town or City.

OR

Is adjacent to at least 1 Town, City, or Ocean.

No matter how many sources are in or adjacent to an Explored land, you only add one Explorer. Explorers are added directly from the supply, not moved around on the board.