... then take the top two tiles off of the desk and place them (face up) next to the start tile to create the initial board.
[I add this only because the first few times I played, each time it took me forever to figure out if the initial tiles were counted in the scenario's list of tile or not. (They are.)]
We played without initial tiles the first few games. It wasn't stated anywhere that 2/3 tiles start revealed, only shown in an example picture in the Rulebook. Hence, we took it as an example and not as a common rule.
• Map. According to the scenario description, put the starting tile either A side or B side up.
– Reveal two (if using starting tile A) or three (if using B) tiles from the Tile deck and place them as depicted. Orient the tiles in the same direction as the starting tile.
– For all revealed sites, check the Site Description card to see what happens when they are revealed.