🎯 Training Mission

Learn how to find and submit flags. Complete these practice challenges before your real missions begin.

0/5 solved · 0/25 pts

📋 How To Play

In this game, you're looking for hidden codes called flags. Every flag looks like this: agent{something}. When you find one, type it into the box and click Check. If it's correct, you'll score points! Flags are always lowercase.

On harder missions, you'll get hints if you're stuck — look for the hint buttons.

In this game, you'll be searching for secret codes called flags. They always look like this: agent{...}

Here's your very first flag — no tricks, just type it into the box below:

agent{welcome}

✓ Flag captured! You've got the idea.

Real flags won't always be handed to you. Sometimes they're hiding in plain sight — tucked inside ordinary-looking text. Read the mission briefing below carefully. The flag is in there somewhere.

MISSION BRIEFING: Welcome to the agency, recruit. Your training begins today. You'll need patience, curiosity, and agent{sharp-eyes} to spot hidden clues that others would miss. Every detail matters. A good investigator reads everything — even the boring parts. Are you ready?

Read every single word in the briefing above. The flag is written right there in the text — it follows the agent{...} pattern.

✓ Sharp eyes indeed! You spotted it.

Information can hide in images too. Look carefully at every part of this picture — the flag is written somewhere on it, but it's small. Check the corners and edges.

Top Secret File — look carefully

Look in the bottom-right corner of the image. The flag is written in small grey text.

✓ Good eyes! You found the hidden text in the image.

This one is harder. The flag is written on the image below, but it's almost the same colour as the background. You might need to look very carefully, tilt your screen, or try saving the image and opening it in a different program to adjust the brightness.

Classified document — the flag is hiding in plain sight

Classified document — the flag is hiding in plain sight

The flag is hidden among the "text lines" in the document. It's very close in colour to the background but not quite the same.

Try saving the image, opening it in Paint, and using the brightness or contrast controls. Or look around the middle-left area of the document very carefully. The word "agent" is there.

✓ Impressive! You found a nearly-invisible flag. That's a real steganography skill.

Download the image below. You don't even need to open it — the flag is hiding somewhere obvious. Think about everything you can see about a file before you open it.

📥 Download Mystery File

After you download the file, look at its file name in your Downloads folder. What does it say?

✓ The file name was the clue! Real investigators check everything — not just what's inside.