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Level I Challenges (89)

All challenges in Level I, ordered by date posted (the most recent appear first).

An Invisible Message

[veselovsky-08] - 56 users already solved this challenge, 14 are working on it.
 
 
 

A friend of yours sent you a file that seems to be empty. Was it just a mistake or is there a secret to reveal?
Read more...

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Click here to download the additional file of the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-10-17 18:25
Maximum number of attempts for this challenge: 10

All successful users of this challenge

Rank User (#56) Achieved points (Global score) y-m-d - h:m:s

Seth Kintigh (DarkFibre) 200 (79471) 2011-10-17 22:25:26
J. M. (jomandi) 200 (113270) 2011-10-18 15:35:46
Armin Krauss (argh) 150 (206965) 2011-10-18 19:36:47
Dano (Dano) 107 (14610) 2011-10-30 18:31:14
#5 Christian Matt (Luy) 107 (9889) 2011-10-31 22:02:55
#6 The Killer (Killer) 104 (42393) 2011-11-09 02:47:16
#7 Bart den Hartog (Bart13) 103 (148936) 2011-11-14 20:37:29
#8 Michael Möller (michaelm) 102 (253196) 2011-11-30 15:14:04
#9 John Willemse (Melting Brains) 102 (1316) 2011-12-13 14:19:25
#10 Jascha Koch (yosh) 101 (2201) 2011-12-29 13:26:31
#11 Peter Mustermann (Gummiboot) 101 (60285) 2011-12-29 14:09:40
#12 Mayuresh Anand (effort2break) 101 (8728) 2011-12-29 18:58:48
#13 Wombat (Wombat) 101 (5822) 2012-01-06 15:34:27
#14 Tom Tox (tox) 101 (17708) 2012-02-02 10:44:32
#15 h3po (h3po) 101 (20433) 2012-02-07 12:17:00
#16 J Br (j.br) 101 (3242) 2012-02-29 14:22:41
#17 Hans Peter (hanspeter) 101 (52356) 2012-03-24 12:20:58
#18 Kurt Gebauer (Yokozuna) 101 (282608) 2012-04-01 20:52:07
#19 Dusan (xxdradus) 100 (40436) 2012-06-09 15:28:24
#20 E.T (Ertheb) 100 (81809) 2012-07-23 18:22:20
#21 Harry (Schwabenbambi) 100 (2409) 2012-10-11 17:22:07
#22 Stepan (m1sterx) 100 (19165) 2012-11-07 12:18:29
#23 Hans Joachim Girulat (joregi) 100 (36278) 2013-04-29 16:47:56
#24 Peter Grosse-Hering (Peter) 100 (8097) 2013-07-03 20:42:18
#25 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-09-10 23:55:21
#26 Pavel (haw) 100 (22728) 2014-01-15 18:07:04
#27 Kim H. S. (tenchijin) 100 (25468) 2014-03-17 12:22:29
#28 Tina (BTina) 100 (1500) 2014-06-03 01:50:02
#29 Karl Schutt (günter) 100 (44374) 2014-08-09 21:33:52
#30 julius gaius (julius) 100 (25581) 2014-09-10 13:27:35
#31 Robert (rm) 100 (56475) 2014-09-26 00:42:04
#32 Francisco Moraes (fmoraes) 100 (90044) 2014-11-06 19:46:29
#33 Julia Bernotat (El Greco ) 100 (81129) 2014-11-09 22:40:35
#34 George (Theofanidis) 100 (123216) 2014-11-18 16:59:20
#35 Bernhard Gruber (bgr) 100 (22889) 2014-11-19 10:45:35
#36 HolgerK (HolgerK) 100 (25776) 2015-01-15 21:59:13
#37 Andreas Frerichs (Ossili) 100 (33266) 2015-04-08 19:41:48
#38 Alain (Integral) 100 (207924) 2015-07-31 15:44:17
#39 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-07 18:29:04
#40 Rainer Zufall (kiekuk) 100 (56786) 2015-12-08 09:23:09
#41 Dominik M. (Sgt. Pepper) 100 (128575) 2015-12-31 16:41:13
#42 Nicolas (nicosPavlov) 100 (257791) 2016-12-03 09:43:40
#43 S (Zyphe) 100 (13361) 2017-01-11 21:24:14
#44 chris (c2) 100 (51973) 2017-03-21 22:58:34
#45 Mir Dim (mir0soft) 100 (79760) 2017-04-04 20:33:34
#46 D3d4lu5 (D3d4lu5) 100 (363488) 2017-12-27 10:15:42
#47 Ines (bufo01) 100 (5676) 2018-01-20 14:05:36
#48 Alain Collignon (vexilla72) 100 (123666) 2018-06-09 09:14:29
#49 Random Dude (rnd) 100 (103645) 2018-10-22 23:18:36
#50 Michael (FoM) 100 (57794) 2018-11-24 02:10:33
#51 madness (madness) 100 (71592) 2019-02-14 13:03:43
#52 Mike (RogueRamblers) 100 (75961) 2019-06-24 17:28:15
#53 Eugene (lim0n) 100 (178540) 2019-09-21 16:21:35
#54 0bliviate (0bliviate) 100 (8634) 2019-11-19 15:32:13
#55 Polaris (Polaris) 100 (32963) 2020-10-01 22:36:45
#56 sarah b (silva) 100 (49171) 2020-12-22 13:37:32
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   +++    [11:11 - 24.06.2021] bestwishes solved the Level I challenge 'Number Sequence — Part 6'    +++    [11:01 - 24.06.2021] E01814058 solved the Level II challenge 'Alice's Birthday Party (Part 1)'    +++    [10:57 - 24.06.2021] E01814058 solved the Level II challenge 'Heartbleed — Part 3'    +++    [10:56 - 24.06.2021] bestwishes solved the Level I challenge 'Find the right route — Part 1'    +++    [10:54 - 24.06.2021] smf12 solved the Level I challenge 'Find the right route — Part 1'    +++