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The river Pregel ran through the town of Konigsberg. In the river were two islands, connected to each other and the rest of the city by seven bridges.

The residents of Konigsberg challenged each other to walk through the city, and cross each of the seven bridges exactly once.

Can you find a path that they might have taken?

This is the 'Seven Bridges of Konigsberg' puzzle, tackled by Leonhard Euler in 1736.

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Place letters into the grid such that every row, column, and 2x2 block has letters (in any order) that form a common word. Each letter is only used once, and no letter is repeated in the rows / cols / blocks.

Letters allowed: D O G D A Y S

		C
L			K
A	T	E
	S	P	I

Note: this puzzle is not interactive, and the squares cannot be clicked.

Puzzle Copyright © Alan Stillson and Frank Longo

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Hidden in the grid below are eight, 7-letter words. Each word begins with the central R and you can move one letter in any direction to the next letter. All of the letters are used exactly once each. What are the words?

T	A	E	R	O	B	O
E	T	G	S	T	N	W
R	N	E	E	A	I	E
I	N	U	R	E	F	R
N	B	U	O	E	E	E
B	S	E	A	E	V	E
I	D	H	T	S	G	N

Note: this puzzle is not interactive, and the letters cannot be clicked.

Puzzle Copyright © Kevin Stone

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Place the digits from 1 to 9 in each closed area so that the sum of the digits in each large square is the same.

1 has already been placed.

Puzzle Copyright © Cihan Altay

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