User: code a simple 2d game in python where its possible to place squares in a grid. i want to use the mouse cursor to point to the square position and left click to place and right click to remove square.
Assistant: Creating a simple 2D grid-based game where you can place and remove squares using mouse clicks can be done using the Pygame library. Pygame is a set of Python modules designed for writing video games. It provides functionalities like creating windows, handling input, and drawing graphics.

First, you need to install Pygame if you haven't already:

```bash
pip install pygame
```

Here's a simple implementation of the game you described:

```python
import pygame
import sys

# Initialize Pygame
pygame.init()

# Constants for the grid and window
GRID_SIZE = 20
WINDOW_WIDTH, WINDOW_HEIGHT = 400, 400
ROWS, COLS = WINDOW_HEIGHT // GRID_SIZE, WINDOW_WIDTH // GRID_SIZE
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
GRAY = (200, 200, 200)
RED = (255, 0, 0)

# Set up the display
window = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption("Grid Game")

def draw_grid():
    for x in range(0, WINDOW_WIDTH, GRID_SIZE):
        for y in range(0, WINDOW_HEIGHT, GRID_SIZE):
            rect = pygame.Rect(x, y, GRID_SIZE, GRID_SIZE)
            pygame.draw.rect(window, GRAY, rect, 1)

def main():
    # This will store the state of the grid: True for filled, False for empty
    grid = [[False for _ in range(COLS)] for _ in range(ROWS)]

    running = True
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

            if event.type == pygame.MOUSEBUTTONDOWN:
                mouseX, mouseY = event.pos
                col = mouseX // GRID_SIZE
                row = mouseY // GRID_SIZE

                if event.button == 1:  # Left click to place a square
                    grid[row][col] = True
                elif event.button == 3:  # Right click to remove a square
                    grid[row][col] = False

        window.fill(WHITE)
        draw_grid()

        # Draw the squares
        for row in range(ROWS):
            for col in range(COLS):
                if grid[row][col]:
                    rect = pygame.Rect(col * GRID_SIZE, row * GRID_SIZE, GRID_SIZE, GRID_SIZE)
                    pygame.draw.rect(window, RED, rect)

        pygame.display.flip()

    pygame.quit()
    sys.exit()

if __name__ == "__main__":
    main()
```

### Explanation:

1. **Grid Setup**: A grid is set up with a specified `GRID_SIZE`, i.e., the size of each square in pixels. The window size is set to allow a grid layout.

2. **Drawing the Grid**: The function `draw_grid()` renders the grid lines.

3. **Event Handling**: Pygame's event loop checks for mouse clicks:
   - Left-click (button 1) to place a square.
   - Right-click (button 3) to remove a square.

4. **Grid State Tracking**: A 2D list (`grid`) is used to track which squares are filled.

5. **Drawing Filled Squares**: Squares stored as `True` in the `grid` list are drawn using a filled rectangle with a distinct color.

Save this code in a `.py` file and run it. You should be able to click to fill or remove squares on a grid using your mouse. Adjust window size and grid size as needed for your preferences.
User: can you do the same thing in 3d space ?
Assistant: