Puzzle 17
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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Puzzle 18
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?
cer ent ead rat uti spr
ful oun pro ann ope ock
nce een oat est liv ion
nou sev ion ast hou akf
bre bea ens dim bed seb
Puzzle Copyright © Kevin Stone
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Puzzle 19
Fill in the missing numbers with the digits 1 to 9. A diamond shape in the middle means that the four numbers around it add to 20.
Each uses a different way to add to 20, if there is already 1 + 3 + 7 + 9, then there will not be another using the digits 1, 3, 7 and 9 (in any order).
The same digit isn't allowed to touch, even diagonally.
Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (195.08) and is used with permission.
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Puzzle 20
A well-known seven-letter word can be created, by starting with a single letter and adding a letter, one at a time, then mixing the letters, each time making a proper word. Using the clues below, which are not necessarily in the correct order, can you find all seven words? For example, A, AT, TAR, RATE, etc.
Expressing position within limits of space and time.
The subject of self-consciousness.
Frozen atmospheric vapour falling to earth.
To utter musical sounds with the voice.
Cause to oscillate.
Scattering on the earth.
The breaking of divine law.
Puzzle Copyright © Kevin Stone
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