It's very difficult to classify Pizza Chef into a type of game. There's a little bit of time management in it but not a whole lot. There's a bit of three-in-a-row but that's not the entire game. It's almost like a mix between Cake Mania and Bejeweled with a shape puzzle tossed in. The basics of the game are simple. You try to match three objects in a row on your board as customers at your counter order pizzas. The pizzas are in various shapes and sizes. As you match the objects on the board, you open more spaces for you to use. In these spaces you fit the shape/size/type of pizza that each customer wants. For example, if a customer wants a rectangle-shaped pizza, you need to open a space that is 2-squares wide by 4-squares long. Then you place the customer's pizza in that space to "bake."
The bizarre combination in the game makes it interesting for awhile. However, when the levels start to get more difficult, it just gets annoying. It gets difficult to find matches in the shapes that you need them before your customers get angry and stomp off. I really think that the game designers should have picked one type of game and stuck with it instead of trying to mix two very different genres together.