CTF Archive

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)
Explaination:
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)

11/21/2025 - 12/12/2025

The answer is: (mouse over or touch below to see)

Answer: CHICKENS CLUCK DUCKS QUACK AND CRACKERS CRACK
Explaination:
Take the original message...
'CEUCADKRHNCKCCEAISKSKRRCCCDQAASKKLUUNCC'
and put a line break after every 8 characters

              CEUCADKR

              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
Explaination: 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
Explaination: 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
Explaination: 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
Explaination: 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
Explaination: 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)

Explaination:
Flag 1: Go to the home page and look closly 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

Explaination: 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

Explaination: 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"

Explaination: 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

Explaination: 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

Explaination: 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

Explaination: 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/

Explaination: 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