Brain Teasers and Puzzles 

Place letters into the grid such that every row, column, and 2 x 2 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: C O L U M B U S

D			K
	P
		E	T
E	L		A

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

Puzzle Copyright © Alan Stillson and Frank Longo

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Starting with the 6 in the bottom left corner, what is the highest total you can make, if you only move up or right, using the mathematical signs on the way?

+	4	−	1	+	3
2	+	4	−	1	+
−	3	+	2	−	2
2	−	4	+	3	−
+	3	−	1	+	2
6	+	1	−	2	+

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

Puzzle Copyright © Kevin Stone

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A woman had three old coins: a silver dollar, a quarter, and a dime. Each coin was a little battered and had a piece missing. She found that exactly the same fraction had broken away from each coin.

What fraction of each was missing if the value of the remaining bits of coins was now exactly one dollar in total?

For this puzzle it can be assumed that ¹/₂ a coin is worth ¹/₂ of its value.

Based on a puzzle by Henry Ernest Dudeney.

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Below, 10 nine-letter words have been broken into chunks of three letters.

The chunks have been moved around, no chunk is used twice, and all of the chunks are used.

Can you determine what the 10 words are?
som one dbr pen rtm ber
nes ent ive eph eti ens
mes off eak eid sep win
erd tel day ter wed tem
aft apa own car ern oon

Puzzle Copyright © Kevin Stone

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