The expansion of the city centre is in full swing. You run one of the companies that is tasked with the construction of skyscrapers. However, there are clear guidelines: if you build a new building, you must participate in the construction of all directly adjacent buildings. And not only that! The city administration also makes aesthetic specifications: two neighboring buildings must never have the same colour. Since your company is not the only one working on the project, strong competition can be expected. To be one step ahead of the others and win the game, you have to plan cleverly and leave the competition as little room as possible.