World Traveller (in General) Rating: 3.00 Posted on 2010-08-29 by Andre (No Solution Yet, 2 Comments)
Keys to the World (in Sequences) Rating: 3.00 Posted on 2010-06-22 by Andre (No Solution Yet, 4 Comments)
Use the stairs! (in Just Math) Rating: 4.50 Posted on 2008-09-12 by Andre (No Solution Yet, 4 Comments)
Devils in my stomach (in Cryptography) Rating: 3.71 Posted on 2006-02-26 by Andre (No Solution Yet, 18 Comments)
Snooker table (in Geometry) Rating: 4.00 Posted on 2006-02-11 by Andre (No Solution Yet, 14 Comments)
Balls in Space (in Geometry) Rating: 4.40 Posted on 2005-12-09 by Andre (No Solution Yet, 12 Comments)
