Rosita has a basket of goodies to share with her guests, but she is not sure how many items are needed. The player helps her set the proper amount on the table. Rosita's Fiesta is different from other preschool math games because the computer never counts for the child. It is up to the player to decide if the quantities are equal.
Sadly, the sun has set on this game because it was built in Flash. To get a sense of game play, watch this video on YouTube.