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Why does this solution guarantee that the prince knocks on the right door to find the princess?

Coin Flipping Game with the Devil

Turn off all lights in a ring-shaped palace

Are there eighteen or twenty bars in my castle?

Left coin, right coin, last coin?

Who shall come to the tea party?

Eight coins for the fair king

Hungry lions and a goat

Where do all the doors lead to?

Two spies throwing stones into a river

Numbers on the blackboard: From 2-2015 to 1-2014

Unfinished Snakes and Ladders

Confused Soldiers

Strategy to beat the casino over the long haul

A strange computer programming language

Three people wearing hats

On The Subject of Regular Crazy Talk

Reconstructing the results of a 5-team soccer tournament

The maximum period of dancing program

Candy Button Paper

Radioactive Rods

Exponential time in a Blue Eyes variant

A row of 2015 red and white chips

Which river is the treasure in?

Incoming enemy! Scout, dispatch! [duplicate]

100 Dwarves and a tiny room

REALLY important days in history

Glory to Arstotzka—The Glorious Infinite Regiment

Find the color of the chess pieces

Ants on a Hula Hoop