CTF Archive
4/10/2026 - 4/24/2026
On this page there's lots to do
finish a thing and find a clue
But beware when you play
For Sunday is the hardest day
Friday and Saturday are not easy either
do it Monday or Tuesday for a breather
Wednesday and Thursday are probably all right
you will only have a little fight
When you finish, the flag will appear
You can stay on this page, it is here.
And when you've reached this state of bliss
You'll know because it looks like this:
flag{the_secret_you_are_looking_for}
The one in the meta tags don't count,
That is old and already been found
Sudoku Puzzle
The answer is: (mouse over or touch below to see)
Answer:
flag{Suji_Wa_Dokushin_Ni_Kagiru}
Explanation:
Solve the sudoku to see the flag!
flag{Suji_Wa_Dokushin_Ni_Kagiru}
Explanation:
Solve the sudoku to see the flag!
3/20/2026 - 4/3/2026
The answer is: (mouse over or touch below to see)
ANSWER:
EXPLANATION:
Inspect the audio file using a tool that provides a spectrogram view.
A good free one that works on most platforms is Audacity
EXPLANATION:
Inspect the audio file using a tool that provides a spectrogram view.
A good free one that works on most platforms is Audacity
3/6/2026 - 3/20/2026
The answer is: (mouse over or touch below to see)
Answer:
The Lincoln Memorial
Explanation:
After you do the binary math, you end up with coordinants.
Plug those into Maps and you're at the Lincoln Memorial!
The Lincoln Memorial
Explanation:
After you do the binary math, you end up with coordinants.
Plug those into Maps and you're at the Lincoln Memorial!
2/20/2026 - 3/6/2026
You must use this specific file to find the flags!
The answer is: (mouse over or touch below to see)
Answer:
FLAG_1{Knock knock. Who's there?}
FLAG_2{User. User Who?}
FLAG_3{Click all the images of traffic lights}
Explanation: The flags are hidden
inside the image file. Download it and
run commands to extract the flags.
Find Flag 1 (metadata comment)
exiftool SamsCTF_02_20_2026_3flags.jpg
Flag 2 (steghide hidden file)
steghide extract -sf SamsCTF_02_20_2026_3flags.jpg
cat flag2.txt
Find Flag 3 (binwalk appended zip)
binwalk -e SamsCTF_02_20_2026_3flags.jpg
cd _ SamsCTF_02_20_2026_3flags.jpg.extracted
unzip *.zip
cat flag3.txt
FLAG_1{Knock knock. Who's there?}
FLAG_2{User. User Who?}
FLAG_3{Click all the images of traffic lights}
Explanation: The flags are hidden
inside the image file. Download it and
run commands to extract the flags.
Find Flag 1 (metadata comment)
exiftool SamsCTF_02_20_2026_3flags.jpg
Flag 2 (steghide hidden file)
steghide extract -sf SamsCTF_02_20_2026_3flags.jpg
cat flag2.txt
Find Flag 3 (binwalk appended zip)
binwalk -e SamsCTF_02_20_2026_3flags.jpg
cd _ SamsCTF_02_20_2026_3flags.jpg.extracted
unzip *.zip
cat flag3.txt
2/6/2026 - 2/20/2026
(for copy and paste)
53 48 4c 49 45 54 53 48 54 4d 53 45 46 45 47
50 41 41 45 53 45 56 49 54 50 4d 45 45 52 50
54 52 49 53 4d 50 49 48 47 53 49 42 49 4c 4f
4f 4f 42 54 48 50 41 50 52 4c 49 4f 52 45 4e
49 49 41 4f 53 49 45 4c 41 4e 4e 50 54 43 4f
4e 4f 49 54 41 52 54 4c 49 46 58 45 48 41 49
4d 43 49 50 48 45 52 45 56 50 47 52 47 45 54
45 45 49 49 48 48 4a 48 50 4e 45 49 4e 47 43
54 44 53 45 4e 49 4d 50 49 50 59 46 4e 43 45
52 50 44 47 4f 54 55 46 4c 41 48 49 4e 54 4a
4e 54 50 41 59 4c 4f 41 44 52 54 4f 49 4c 4e
45 45 55 49 53 4f 59 41 4e 4c 52 4f 58 4e 49
41 41 59 59 50 52 45 4f 41 45 41 52 46 43 44
49 54 47 53 49 52 50 53 45 4d 52 50 58 45 4f
4f 42 46 55 53 43 41 54 49 4f 4e 50 4c 45 58
Q0lQSEVSIEhBU0ggU0FMVElORyBQQVlMT0FEIE9CRlVTQ0FUSU9OIFBSRUVN
UFRJVkUgRVhGSUxUUkFUSU9OIElOSkVDVElPTiBSRVBMQVkgU1BPT0ZJTkc=
50 41 41 45 53 45 56 49 54 50 4d 45 45 52 50
54 52 49 53 4d 50 49 48 47 53 49 42 49 4c 4f
4f 4f 42 54 48 50 41 50 52 4c 49 4f 52 45 4e
49 49 41 4f 53 49 45 4c 41 4e 4e 50 54 43 4f
4e 4f 49 54 41 52 54 4c 49 46 58 45 48 41 49
4d 43 49 50 48 45 52 45 56 50 47 52 47 45 54
45 45 49 49 48 48 4a 48 50 4e 45 49 4e 47 43
54 44 53 45 4e 49 4d 50 49 50 59 46 4e 43 45
52 50 44 47 4f 54 55 46 4c 41 48 49 4e 54 4a
4e 54 50 41 59 4c 4f 41 44 52 54 4f 49 4c 4e
45 45 55 49 53 4f 59 41 4e 4c 52 4f 58 4e 49
41 41 59 59 50 52 45 4f 41 45 41 52 46 43 44
49 54 47 53 49 52 50 53 45 4d 52 50 58 45 4f
4f 42 46 55 53 43 41 54 49 4f 4e 50 4c 45 58
Q0lQSEVSIEhBU0ggU0FMVElORyBQQVlMT0FEIE9CRlVTQ0FUSU9OIFBSRUVN
UFRJVkUgRVhGSUxUUkFUSU9OIElOSkVDVElPTiBSRVBMQVkgU1BPT0ZJTkc=
The answer is: (mouse over or touch below to see)
Answer: Its a word search!
Explanation:
Convert the top section from Hex
Convert the bottom section from Base64
Then you have this...
CIPHER HASH SALTING PAYLOAD OBFUSCATION PREEMPTIVE
EXFILTRATION INJECTION REPLAY SPOOFING
Explanation:
Convert the top section from Hex
Convert the bottom section from Base64
Then you have this...
S H L I E T S H T M S E F E G
P A A E S E V I T P M E E R P
T R I S M P I H G S I B I L O
O O B T H P A P R L I O R E N
I I A O S I E L A N N P T C O
N O I T A R T L I F X E H A I
M C I P H E R E V P G R G E T
E E I I H H J H P N E I N G C
T D S E N I M P I P Y F N C E
R P D G O T U F L A H I N T J
N T P A Y L O A D R T O I L N
E E U I S O Y A N L R O X N I
A A Y Y P R E O A E A R F C D
I T G S I R P S E M R P X E O
O B F U S C A T I O N P L E X
P A A E S E V I T P M E E R P
T R I S M P I H G S I B I L O
O O B T H P A P R L I O R E N
I I A O S I E L A N N P T C O
N O I T A R T L I F X E H A I
M C I P H E R E V P G R G E T
E E I I H H J H P N E I N G C
T D S E N I M P I P Y F N C E
R P D G O T U F L A H I N T J
N T P A Y L O A D R T O I L N
E E U I S O Y A N L R O X N I
A A Y Y P R E O A E A R F C D
I T G S I R P S E M R P X E O
O B F U S C A T I O N P L E X
CIPHER HASH SALTING PAYLOAD OBFUSCATION PREEMPTIVE
EXFILTRATION INJECTION REPLAY SPOOFING
1/23/2026 - 2/6/2026
The answer is: (mouse over or touch below to see)
Answer: "I'll be back"
a quote from The Terminator (1984)
Explanation:
Take the hex codes that were shown during episode 31
49 e2 80 99 6c 6c 20 62 65 20 62 61 63 6b
Convert from hex = "Iâll be back"
ERROR! The hex should have said
49 27 6c 6c 20 62 65 20 62 61 63 6b
Convert from hex = "I'll be back"
a quote from The Terminator (1984)
Explanation:
Take the hex codes that were shown during episode 31
49 e2 80 99 6c 6c 20 62 65 20 62 61 63 6b
Convert from hex = "Iâll be back"
ERROR! The hex should have said
49 27 6c 6c 20 62 65 20 62 61 63 6b
Convert from hex = "I'll be back"
1/9/2026 - 1/23/2026
The answer is: (mouse over or touch below to see)
Answer: "One does not
simply walk into Mordor"
a quote from Lord of the Rings: The Fellowship of the Ring (2001)
Explanation:
Take the original message and change the font from
Wingdings to any other font that uses letters!
a quote from Lord of the Rings: The Fellowship of the Ring (2001)
Explanation:
Take the original message and change the font from
Wingdings to any other font that uses letters!
12/12/2025 - 1/9/2026
The answer is: (mouse over or touch below to see)
Answer: "There is no spoon"
a quote from The Matrix (1999)
Explanation:
Take the original message and reverse the string
'Gurer vf ab fcbba'
Rotate (Simple substitution) the letters until the answer appears
Explanation:
Take the original message and reverse the string
'Gurer vf ab fcbba'
Rotate (Simple substitution) the letters until the answer appears
Hvsfs wg bc gdccb (Rot1)
Iwtgt xh cd heddc (Rot2)
Jxuhu yi de ifeed (Rot3)
Kyviv zj ef jgffe (Rot4)
Lzwjw ak fg khggf (Rot5)
Maxkx bl gh lihhg (Rot6)
Nbyly cm hi mjiih (Rot7)
Oczmz dn ij nkjji (Rot8)
Pdana eo jk olkkj (Rot9)
Qebob fp kl pmllk (Rot10)
Rfcpc gq lm qnmml (Rot11)
Sgdqd hr mn ronnm (Rot12)
There is no spoon (Rot13)
Iwtgt xh cd heddc (Rot2)
Jxuhu yi de ifeed (Rot3)
Kyviv zj ef jgffe (Rot4)
Lzwjw ak fg khggf (Rot5)
Maxkx bl gh lihhg (Rot6)
Nbyly cm hi mjiih (Rot7)
Oczmz dn ij nkjji (Rot8)
Pdana eo jk olkkj (Rot9)
Qebob fp kl pmllk (Rot10)
Rfcpc gq lm qnmml (Rot11)
Sgdqd hr mn ronnm (Rot12)
There is no spoon (Rot13)
11/21/2025 - 12/12/2025
The answer is: (mouse over or touch below to see)
Answer: CHICKENS CLUCK
DUCKS QUACK AND CRACKERS CRACK
Explanation:
Take the original message...
'CEUCADKRHNCKCCEAISKSKRRCCCDQAASKKLUUNCC'
and put a line break after every 8 characters
Now read the vertical columns of text for the answer to appear!
Explanation:
Take the original message...
'CEUCADKRHNCKCCEAISKSKRRCCCDQAASKKLUUNCC'
and put a line break after every 8 characters
CEUCADKR
HNCKCCEA
ISKSKRRC
CCDQAASK
KLUUNCC
HNCKCCEA
ISKSKRRC
CCDQAASK
KLUUNCC
Now read the vertical columns of text for the answer to appear!
11/7/2025 - 11/21/2025
The answer is: (mouse over or touch below to see)
Answer: Mint Cream
Explanation: f5 + ff + fa
#F5FFFA is the hex code for 'Mint Cream'
Explanation: f5 + ff + fa
#F5FFFA is the hex code for 'Mint Cream'
10/31/2025 - 11/7/2025
The answer is: (mouse over or touch below to see)
Answer: Pumpkin
Explanation: ff + 75 + 18
#FF7518 is the hex code for 'Pumpkin'
Explanation: ff + 75 + 18
#FF7518 is the hex code for 'Pumpkin'
10/24/2025 - 10/31/2025
The answer is: (mouse over or touch below to see)
Answer: Tumbleweed
Explanation: de + aa + 88
#DEAA88 is the hex code for 'Tumbleweed'
Explanation: de + aa + 88
#DEAA88 is the hex code for 'Tumbleweed'
10/17/2025 - 10/24/2025
The answer is: (mouse over or touch below to see)
Answer: Timberwolf
Explanation: db + d7 + d2
#DBD7D2 is the hex code for 'Timberwolf'
Explanation: db + d7 + d2
#DBD7D2 is the hex code for 'Timberwolf'
10/10/2025 - 10/17/2025
The answer is: (mouse over or touch below to see)
Answer: Satin Sheen Gold
Explanation: cb + a1 + 35
#CBA135 is the hex code for 'Satin Sheen Gold'
Explanation: cb + a1 + 35
#CBA135 is the hex code for 'Satin Sheen Gold'
9/26/2025 - 10/3/2025
The answer is: (mouse over or touch below to see)
Answer:
Flag 1: 3y3_0f_7h3_b3h0ld3r (eye of the beholder)
Flag 2: th3_c4k3_15_4_l13 (the cake is a lie)
Flag 3: KL44TU_B4RR4D4_N1KT0 (KLAATU BARRADA NIKTO)
Explanation:
Flag 1: Go to the home page and look closely at the picture with the eye
Flag 2: Inspect the head element of the Games page
Flag 3: Go to ridgebacknet.com/robots.txt
Flag 1: 3y3_0f_7h3_b3h0ld3r (eye of the beholder)
Flag 2: th3_c4k3_15_4_l13 (the cake is a lie)
Flag 3: KL44TU_B4RR4D4_N1KT0 (KLAATU BARRADA NIKTO)
Explanation:
Flag 1: Go to the home page and look closely at the picture with the eye
Flag 2: Inspect the head element of the Games page
Flag 3: Go to ridgebacknet.com/robots.txt
9/19/2025 - 9/26/2025
The answer is: (mouse over or touch below to see)
Answer:
F1nd1ng_4_w0rd_1n_y0ur_NPM_p4ck4g3
Explanation: Substitute the glyphs using the key,
then convert from hex to reveal the answer!
Explanation: Substitute the glyphs using the key,
then convert from hex to reveal the answer!
9/5/2025 - 9/19/2025
The answer is: (mouse over or touch below to see)
Answer: Wenge
Explanation: 64 + 54 + 52
#645452 is the hex code for 'Wenge'
Explanation: 64 + 54 + 52
#645452 is the hex code for 'Wenge'
8/29/2025 - 9/12/2025
The answer is: (mouse over or touch below to see)
Answer: "IF YOU CAN READ
THIS
THANK A COMPUTER SCIENTIST"
Explanation: echo "IF YOU CAN READ THIS
THANK A COMPUTER SCIENTIST"
| od -x | tr -d ' \n' | rev | rot13 | fold -w 25
To turn the puzzle into text you need to
THANK A COMPUTER SCIENTIST"
Explanation: echo "IF YOU CAN READ THIS
THANK A COMPUTER SCIENTIST"
| od -x | tr -d ' \n' | rev | rot13 | fold -w 25
To turn the puzzle into text you need to
- Remove the line breaks so the puzzle is one long string.
-
Apply ROT13 (Caesar cipher shift by 13)
- This makes the letters only use a–f, which are valid hex digits.
- Reverse the whole string.
-
Read it as hex:
- Take the string two characters at a time (like 49, 46, 20, …).
- Convert each pair from hex into its ASCII character.
- Example: 49 = I, 46 = F, 20 = space.
- Put it all together and the hidden message appears!
8/29/2025 - 9/5/2025
The answer is: (mouse over or touch below to see)
Answer: Firebrick
Explanation: B2 + 22 + 22
#B22222 is the hex code for 'Firebrick'
Explanation: B2 + 22 + 22
#B22222 is the hex code for 'Firebrick'
8/22/2025 - 8/29/2025
The answer is: (mouse over or touch below to see)
Answer: Bubbles
Explanation: E7 + FE + FF
#E7FEFF is the hex code for 'Bubbles'
Explanation: E7 + FE + FF
#E7FEFF is the hex code for 'Bubbles'
8/15/2025 - 8/22/2025
The answer is: (mouse over or touch below to see)
Answer: Baby Blue Eyes
Explanation: A1 + CA + F1
#A1CAF1 is the hex code for 'Baby Blue Eyes'
Explanation: A1 + CA + F1
#A1CAF1 is the hex code for 'Baby Blue Eyes'
8/1/2025 - 8/8/2025
The answer is: (mouse over or touch below to see)
Answer:
https://www.apple.com/customer-letter/
Explanation: Published on the 47 day of 2016, that post references the
All Writs Act of 1789,
and the 11116274 is the id of the post in the url at
https://news.ycombinator.com/item?id=11116274
Explanation: Published on the 47 day of 2016, that post references the
All Writs Act of 1789,
and the 11116274 is the id of the post in the url at
https://news.ycombinator.com/item?id=11116274
FOLLOW US
ABOUT
Copyright ©2026 Ridgeback Network Defense, Inc. All rights reserved.
CONTACT US
[email protected]