Monopoly, upgrade several houses into hotels.

That is, after building three green houses, you can spend money to tear down the three green houses and replace them with a red hotel when you get to that place.

If you own all unsecured land of the same color S, you can choose to build a house before any player rolls the dice, except for an extra round, because you roll the dice with the same number of points. The house must be built on the land with the least number of houses in the same group, which means that the house must be built evenly. Cannot be built on mortgaged land. When all the land is covered by four houses, players can choose to build hotels. After the hotel is completed, four houses will be handed over to the bank.