The One-Stop Shop is a mini-game present in Professor Layton and the Miracle Mask. This mini-game is given to Luke Triton by Madame Lapushka after solving puzzle 010 - The Place to Be!. Completing all levels will unlock The Shopkeeper's House in Professor Layton's Challenges.
To successfully complete each level, you must lay down items in an order that will tempt the buyer into purchasing everything from the shelf. This is done by placing two items of the same type or color next to each other. Placing more than two items of the same type or color next to each other, however, will not allow you to successfully complete the level.
 Fresh Fruits
Received from Madame Lapushka after completing puzzle 010 - The Place to Be!.
Received from Esther after completing puzzle 019 - Spinning Maize.
 Explorer's Needs (US) / Orienteering (UK)
Received from Madelaine after completing puzzle 030 - Big Cake, Little Cake.
Received Hanna after completing puzzle 042 - Couple at the Café.
 Baked Goods
Received from Madame Lapushka after completing puzzle 047 - Trial by Tennis.
 Green Thumb (US) / Flora (UK)
Received from Lucille Layton after completing puzzle 057 - Stitching Squares.
Received Michelle after completing puzzle 072 - A Cup of Tiles.
 Plush Toys (US) / Soft Toys (UK)
Received Sterling after completing puzzle 083 - Settle the Scores.
Received from Collette after completing puzzle 114 - Emperor's Throne 2.
Received from Yuming after completing puzzle 129 - A Sweeping Solution.