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About Positano: The Crowded Cliffside, from BoardGameGeek:

Positano: The Crowded Cliffside includes components in two new colors so that now up to six players can bid for building spaces in Positano. To give players more room in which to build, the expansion includes a new set of cliffside steps that expand the playing area to a 5x5 area instead of 4x4. This larger cliffside also allows for a four-player variant game that lasts six rounds instead of the usual four. This expansion also includes a solo mode since the cliffside needs so much construction that you and Otto each need two colors to handle it all!