Turn structure
On your turn, you must choose exactly one of two available actions.
Each turn, the active player must choose exactly one of the following two actions: (1) Build a House, or (2) Draw 2 Cards. You cannot take both actions in the same turn.
Building
To build on a space, play one or more cards that match the color of that space.
When taking the Build a House action, you must play one or more cards from your hand that match the color of the target space. Each card played allows you to place one house on that space. You cannot play cards of a different color to build on a space.
Building
Houses are stacked on a space — you place one house per card played, all on the same space.
When building a house, you may play multiple matching cards at once to place multiple houses on the same space in a single build action. Houses stack on top of each other on the space. Each card played adds exactly one house to the target space.
Scoring
Score points equal to the number of houses on the space multiplied by the number of dots on that space.
Immediately upon building on a space, the active player scores points equal to (total number of houses on that space, including any just placed) × (number of dots printed on that space). This scoring happens each time you build on a space.
Building
After building on a space, you may optionally continue building on an adjacent space by paying for it separately, and repeat.
After completing a build on a space (playing cards and scoring), you may optionally choose to build on an adjacent space. You must pay the full card cost (cards matching that adjacent space's color) separately. You may continue chaining builds to further adjacent spaces in this way, repeating as long as you can pay and spaces are adjacent. Each additional space requires its own card payment.
General
Adjacent means directly neighboring on the board — houses must be placed next to the central space, another house, or a park.
A space is considered adjacent if it is directly neighboring the central space, a space containing at least one house (belonging to any player), or a space containing a park token. You may only build on a space that is adjacent to at least one of these three things. Spaces that are not connected through this chain cannot be built upon.
Special
Once per round, during the Build a House action, you may place a park by discarding any one card.
While taking the Build a House action, you may optionally place one park token on an eligible adjacent space. This costs one discard of any card (regardless of color). You may only use this option once per round total. Parks count as adjacent anchors, allowing houses to be built next to them.
Drawing
After taking the Build a House action, draw one card.
At the conclusion of a Build a House action (including any optional chain builds and optional park placement), draw one card from the deck into your hand before the end-of-turn discard step.