Yes, I can help you create a Tetris game in C#. The number of classes required may vary depending on the complexity and design of the game, but typically it would require at least the following classes:

1. Game: This class will handle the overall game logic, including initializing the game, managing the game loop, and handling user input.
2. Board: This class will represent the game board and manage the placement and movement of Tetriminos (the falling blocks).
3. Tetrimino: This class will represent the individual Tetriminos and handle their movement, rotation, and collision detection.
4. Scoreboard: This class will keep track of the player’s score, level, and other game statistics.
5. Renderer: This class will handle the rendering of the game, including drawing the game board, Tetriminos, and other visual elements.
6. InputManager: This class will handle user input, such as keyboard controls for moving and rotating Tetriminos.

These are the basic classes required for a simple Tetris game. Depending on your specific requirements, you may need additional classes for features like sound effects, high scores, or different game modes.