dr_'s user avatar
dr_'s user avatar
dr_'s user avatar
dr_
  • Member for 7 years
  • Last seen this week
22 votes
3 answers
7k views

The village of the liars and truth-tellers

20 votes
1 answer
679 views

The volumes of the encyclopedia

17 votes
13 answers
4k views

A Palindrome Challenge

16 votes
7 answers
3k views

Flashlight and 8 batteries

6 votes
8 answers
960 views

Strange shopping

6 votes
1 answer
494 views

The program in the computer

5 votes
1 answer
261 views

An island, a boat, and a roulette

5 votes
7 answers
7k views

A man married the sister of his widow [closed]

4 votes
3 answers
251 views

"Twelve of a times" table

4 votes
9 answers
2k views

The London safes and their mysterious combinations

0 votes
1 answer
2k views

The golden chain [duplicate]