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Level I Challenges

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Challenge "An 'unhearable' message"
By: admin on June 5, 2012, 7:58 p.m.
12
29614
By: itnomad  
Feb. 4, 2021, 10:03 p.m.
[  Go to the page:  12  ]
Challenge "Pigpen with a twist — Part 1"
By: admin on Sept. 2, 2011, 1:08 p.m.
23
54396
By: Theofanidis  
Jan. 20, 2021, 10:56 p.m.
Challenge "A hidden word — Part 2"
By: admin on April 16, 2015, 4:47 p.m.
2
5102
By: Theofanidis  
Jan. 19, 2021, 1:07 a.m.
Challenge "Modular Sequences"
By: admin on Sept. 25, 2018, 2:19 p.m.
10
5940
By: tryone144  
Jan. 18, 2021, 6:08 p.m.
[  Go to the page:  12345  ]
Challenge "Monoalphabetic Substitution"
By: admin on May 19, 2010, 10:08 a.m.
68
165158
By: tryone144  
Jan. 13, 2021, 6:13 p.m.
Challenge "Factorization Cipher — Part 1"
By: admin on Oct. 17, 2011, 6:42 p.m.
13
23687
By: itnomad  
Jan. 13, 2021, 5:20 p.m.
[  Go to the page:  12  ]
Challenge "Beaver Code"
By: admin on Aug. 13, 2012, 8:15 p.m.
19
25675
By: itnomad  
Jan. 9, 2021, 1:47 p.m.
Challenge "Number Sequence — Part 2"
By: admin on July 11, 2011, 2:35 p.m.
8
27689
By: ker2x  
Dec. 13, 2020, 4:24 p.m.
[  Go to the page:  12  ]
Challenge "Letter to the Templars — Part 1"
By: admin on July 16, 2012, 9:09 p.m.
15
22314
By: tryone144  
Oct. 8, 2020, 1:12 a.m.
8
19726
By: Veselovský  
June 9, 2020, 11 p.m.
[  Go to the page:  123  ]
Challenge "Snow White and the seven dwarfs"
By: Javex on April 20, 2013, 11:26 a.m.
30
28659
By: tryone144  
March 30, 2020, 8:57 p.m.
[  Go to the page:  12  ]
Challenge "Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1"
By: admin on April 7, 2011, 9:34 a.m.
21
41854
By: tryone144  
March 22, 2020, 9:34 p.m.
[  Go to the page:  123  ]
Challenge "Enigma Combinatorics"
By: admin on Nov. 12, 2010, 3:29 p.m.
35
68980
By: madness  
Feb. 17, 2020, 3:44 p.m.
help
By: dinaPWBF on Feb. 8, 2020, 1:58 p.m.
1
820
By: ancat  
Feb. 9, 2020, 7:40 p.m.
Challenge "Molehunt (Part 1/3)"
By: admin on Oct. 22, 2010, 4:01 p.m.
10
29366
By: sexton  
Aug. 3, 2019, 11:08 a.m.
Challenge "Number Sequence — Part 10"
By: admin on April 18, 2018, 4:56 p.m.
8
4922
By: Bart13  
July 16, 2019, 1:38 a.m.
Challenge "A hidden word"
By: Javex on Jan. 6, 2013, 2:35 p.m.
2
7552
By: Theofanidis  
July 9, 2019, 8:19 a.m.
9
6324
By: sexton  
June 30, 2019, 5:58 p.m.
Challenge "Advent-Challenge — Part 1"
By: admin on Dec. 8, 2017, 7:24 p.m.
2
3030
By: ancat  
June 29, 2019, 11:28 a.m.
2
1452
By: MarquisDeSud  
May 14, 2019, 4:30 p.m.

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