Hi! I understand you're having trouble scrolling down to fully open the Sudoku puzzle in the NYT Games app on your Mac running OS X 10.15.7. I’d like to help get that sorted out for you.

Just to clarify a bit:
- Are you using the Sudoku puzzle through the NYT Games app or from a web browser on your Mac?
- When you say “scrolling down,” do you mean using the trackpad, mouse, or keyboard?
- Is the puzzle partially cut off or frozen in a way that you can’t navigate to the lower part?

Knowing this will help me give you the best advice. In the meantime, here are some general steps to try:

1. Check Window and Zoom Settings:
Sometimes the puzzle window might not be fully visible if zoom settings are off or window size is small. Try pressing Command + 0 (zero) to reset zoom if you are in a browser. If using the app, try resizing the window or maximizing it.

2. Scroll Method:
On your Mac trackpad, try using two fingers to swipe up and down. If scrolling doesn’t work, try using the arrow keys on your keyboard to navigate within the puzzle grid.

3. Refresh or Restart:
Close the app or web browser tab and reopen the Sudoku puzzle. Sometimes reloading resets interface glitches.

4. Clear Cache or App Data:
If you’re on a browser, clearing cached files might help (Safari > Preferences > Privacy > Manage Website Data). For the app, if you can, try quitting and relaunching it. If the problem persists, consider reinstalling the app.

5. Update Software:
Ensure your Mac's OS and the NYT Games app (if using the app) are up to date. Sometimes updates fix compatibility issues.

Let me know what scenario fits best or what you've already tried, and we can go deeper if needed!