Donuts must be made whole! That's the spirit driving your actions in Dollars to Donuts, mostly because the customers in your donut shop will not want to purchase half-donuts that will undoubtedly be stale on their open ends.
To set up the game, place four 1x1 starting tiles on the 6x6 game board that represents your donut shop and take five "dollar" tiles from the bag; on their back side, dollar tiles have either a half donut (plain, chocolate, sprinkle) or a set of donut holes (again in the three flavors). The starting tiles depict half donuts in these three flavors
On a turn, you can purchase a 1x4 donut tile that depicts half donuts along its edges from the six available tiles for a cost of $0-5. You then add this tile to your shop — with some of the tile hanging off the edge of the board if you wish — ideally lining up the half donuts on that tile with those already on your board. If you make a matching donut, i.e., putting two sprinkle halves together, then you take a sprinkle scoring token; if you make a non-matching donut, i.e. a plain half combined with a chocolate half, then you draw a dollar tile from the supply bag. Note, however, that jelly donuts give no dollar tile if paired with a non-jelly donut because who in the world would reward something like that?
To end your turn, you can place a dollar tile on your shop board to complete a donut (and score) or fill a space with donut holes (which might also score). Additionally, you can serve a customer in line by offering them scoring tokens that match their desired donuts, which will earn you more points than the tokens on their own.
When one player has filled every space in their shop or the donut tiles run out, the game ends, with you scoring for satisfied customers, neighborhoods served, donuts still on hand, and donut hole pairs in the shop, while losing points for empty spaces in your shop. The player with the highest score clearly has the most popular shop in town!