Chapter 4 Replacing text ・ MISSION 12

Mission 12: Undo a replacement that went too far

📋 Mission list

Keycat

You replaced every “10” with “11”, and the room number changed too. Go back to before the replacement.

*Monthly meeting notice.txt - Notepad
Subject: October 2026 monthly meeting
Dear Sales team,
Here are the details of our October monthly meeting.
Date: Thursday, October 8, 2026, 15:00–16:00
Place:Meeting room 11B, 5th floor, head office
Item 1: First-half review
Item 2: Second-half targets
Item 3: New customer management system
Bring: laptop
Best regards,
Ln 1, Col 1
Clipboard:(empty)Undo history:Replace all
Keystrokes 0/ Best example: 1

Chapter 4 ・ MISSION 12

Undo a replacement that went too far

You replaced every “10” with “11”, and the room number changed too. Go back to before the replacement.

Now
*Monthly meeting notice.txt - Notepad
Subject: October 2026 monthly meeting
Dear Sales team,
Here are the details of our October monthly meeting.
Date: Thursday, October 8, 2026, 15:00–16:00
Place:Meeting room 11B, 5th floor, head office
Item 1: First-half review
Item 2: Second-half targets
Item 3: New customer management system
Bring: laptop
Best regards,
Goal
Monthly meeting notice.txt - Notepad
Subject: October 2026 monthly meeting
Dear Sales team,
Here are the details of our October monthly meeting.
Date: Thursday, October 8, 2026, 15:00–16:00
Place:Meeting room 10B, 5th floor, head office
Item 1: First-half review
Item 2: Second-half targets
Item 3: New customer management system
Bring: laptop
Best regards,

The tutorial is On. You can change this setting on the mission list page. Mission list

Shortcuts used in this mission

  1. CtrlZ

One Ctrl+Z undoes a whole “Replace all”. Replacing too much is nothing to fear.

On a Mac, use ⌘ (command) instead of Ctrl. Only for replace (Ctrl+H) and redo (Ctrl+Y), press control.

Keyboard only (the mouse does not work here).

* This simulates Notepad and File Explorer in Windows 11 and may differ from the real apps in places.

* Some actions may not work depending on your browser environment (for example, shortcuts used by extensions).