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7 votes
1 answer
535 views

Fill this Sudoku variant so that the sums of numbers in the outlined regions are all different

14 votes
9 answers
4k views

Starting with 2014 "+" signs and 2015 "−" signs, you delete signs until one remains. What’s left?

2 votes
1 answer
162 views

When Mo and Bo met Jo, Mo asked, “Are Bo and I both negative?” What can be deduced about Mo and Bo?

11 votes
4 answers
3k views

What is the least number of colours Peter could use to color the 3x3 square?

-1 votes
1 answer
259 views

Can someone explain this inductive reasoning question

10 votes
2 answers
646 views

Manhattan distance

7 votes
1 answer
328 views

A checkered cross - Colombian Sudoku

8 votes
3 answers
793 views

Fill the grid with numbers to make all four equations true

10 votes
4 answers
1k views

Murder Mystery. Who is the killer?

4 votes
4 answers
849 views

Fill a grid with numbers so that each row/column calculation yields the same number

6 votes
1 answer
224 views

Ying Yang 12x12 - Colombian Sudoku

12 votes
1 answer
306 views

One number grid, two ways to divide it (Part 2)

5 votes
2 answers
222 views

Pinwheels - Colombian Sudoku

9 votes
3 answers
3k views

Sliding Bolt Puzzle - fastest solution (time-wise)

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