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Puzzle 1 

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?

Two islands, one bridge joining. One also has two N, two S. The other also has one N, one S.

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

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Puzzle 2 

Greenjack Round #3 - Logic Puzzles

You find yourself playing a game with your friend.

It is played with a deck of only 16 cards, divided into 4 suits:

   Red, Blue, Orange, and Green.

There are four cards in each suit:

   Ace, King, Queen, and Jack.

All Aces outrank all Kings, which outrank all Queens, which outrank all Jacks, except for the Green Jack, which outranks every other card.

If two cards have the same face value, then Red outranks Blue, which outranks Orange, which outranks Green, again except for the Green Jack, which outranks everything.

Here's how the game is played: you are dealt one card face up, and your friend is dealt one card face down. Your friend then makes some true statements, and you have to work out who has the higher card, you or your friend. It's that simple!

Round 3:
You are dealt the Red Queen and your friend makes three statements:

My card could lose to a Blue card.
Knowing this, if I am more likely to have an Ace or a King than a Queen or a Jack, then I have an Orange card. Otherwise, I don't.
Given all of the information you now know, if I am more likely to have a Jack than an Ace, then I actually have a King. Otherwise, I don't.
Who has the higher card, you or your friend?

Puzzle Copyright © E.J. Shamblen

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Puzzle 3 

Which is longer …

… 250 centimetres or 8 feet?

Puzzle Copyright © Kevin Stone

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Puzzle 4 

Which four vegetables have been merged together?
cab swe rpr eed oaa etn

Puzzle Copyright © Kevin Stone

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