10 questions linked to/from 100 Prisoners' Names in Boxes
367 views

### 100 Cards with numbers in a room [duplicate]

The scenario is like this: There's a room, inside the room there are 100 cards with numbers [1,100] on them (No duplications), the cards are ordered randomly. Two persons stand outside the room, ...
170 views

### Don't Fail MY Exam [duplicate]

A professor decides the following grading scheme in his class. After the final exam is graded, he keeps all the papers upside down on his table in a random order so that no student can recognise his ...
9k views

### How to beat Count Dracula

Abraham Van Helsing and Jonathan Harker play a game against Count Dracula. The three players agree on the following rules: Count Dracula and Van Helsing enter the crypt, while Jonathan Harker ...
1k views

### 100 Prisoners' Names in Boxes - Save them all!

This puzzle is based on 100 Prisoners' Names in Boxes: Names in Boxes The names of 100 prisoners are placed in 100 wooden boxes, one name to a box, and the boxes are lined up on a table ...
874 views

### How to rate difficulty of a classic riddle?

How, as a writer of riddles, can I rate their difficulty? I guess, for me alone, knowing the answer even before the riddle existed, it's pretty much impossible, and I should need some external help. ...
2k views

### Help me find my favourite DVD

I have an admission to make: I very rarely put my DVDs back in the case they came from. Whenever I watch a new DVD I just put whatever DVD is the player in the new case. I put the cases back on the ...
746 views

### Shuffling Cards

I was just thinking about this. Let's say that we have a card deck with 54 cards and the $n$th card from the top is flipped. We repeat a short process of cutting the deck directly in the middle and ...
1k views

### Let's deal with “Names in Boxes” Safely

I met a puzzle, which is basically well known 100 Prisoners' Names in Boxes , but... it has an algorithm, which gives prisoners 100% chance to survive! This is achieved by a small change in the ...