Multiple Text Cursors with Arrow Keys in Sublime Text
Multi-Cursor with Arrow Keys
Add Cursor Below
Cmd-Ctrl-Down (Mac) or Ctrl-Alt-Down (Windows).
Add Cursor Above
Cmd-Ctrl-Up (Mac) or Ctrl-Alt-Up (Windows).
Type Once, Edit Many
All cursors type, delete, and select in unison.
Escape to Single Cursor
Press Esc to drop the extra cursors and return to one.
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While you can place multiple text cursors in Sublime Text with Cmd–Click (Mac) or Ctrl–Click (Windows), here's another technique that comes in handy.
Hold Ctrl–Shift (Mac) or Ctrl–Alt (Windows) and hit Up or Down Arrow to place an additional text cursor above or below the current cursor.

Windows Users: Ctrl–Alt and Arrow keys may rotate the screen. You may need to change or disable those keystrokes in your display settings.