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88 votes

Quick!!! You got only 30 seconds

No real-world car can accelerate faster than $5g$, so the maximum acceleration of the car is under $50m/s^2$. Even if the car instantly decelerates (against a wall or something), the fact that $P$ can ...
Anon's user avatar
  • 2,684
56 votes
Accepted

Escape across the floorboards

The letter can escape by taking the following path:
Deusovi's user avatar
  • 146k
31 votes
Accepted

The cat exchanges places with a drawing of the cat

I think this fits the criteria:
TwoBitOperation's user avatar
25 votes
Accepted

Quick!!! You got only 30 seconds

Total time: 29 seconds
ghosts_in_the_code's user avatar
20 votes

River Crossing Puzzle

A possible way
hexomino's user avatar
  • 136k
19 votes
Accepted

Another river with some extra letters

Is the answer perhaps: Thus:
puzzledPig's user avatar
  • 3,441
19 votes
Accepted

River Crossing Puzzle

Solution:
lois6b's user avatar
  • 3,346
19 votes
Accepted

An overcomplicated Boat Puzzle

It is not that difficult, actually. The number of crossings required is ... And here is how to do it.
Florian F's user avatar
  • 30k
16 votes
Accepted

Zombie horde incoming!

Yikes.   Labeling us 10, 5, 2 and 1 by how long ...
humn's user avatar
  • 21.9k
13 votes
Accepted

numbers want to cross a river, but their sum must be a square number

The minimum is This is achieved by:
Sp3000's user avatar
  • 7,527
13 votes
Accepted

Ali Baba and the 10 thieves

Here’s my quadruple-checked, optimality-guaranteed solution with (Glorfindel’s initial answer had the same crossing count earlier, but UselessInfoMine discovered an error in that method. The updated ...
Bass's user avatar
  • 77.4k
12 votes

Ali Baba and the 10 thieves

Here is a solution with Explanation:
Glorfindel's user avatar
12 votes
Accepted

Farmer needs to get his word across the river

You can do it like this: On each line other than the last, parentheses indicate what is to be moved to the other side.
Gareth McCaughan's user avatar
11 votes
Accepted

Don't look back, crazy clown

Amazing puzzle! Found a solution after a couple of hours of hunting (I hope that all the words I used are allowed in this puzzle)
Zoir's user avatar
  • 1,723
10 votes
Accepted

Boat children and army crossing the river puzzle

You can get one grown person across as follows To generalise this to the captain and 357 soldiers The boat passes shore to shore a total of
hexomino's user avatar
  • 136k
10 votes
Accepted

Nothing but pairs of a kind

ARCHITECTURE: HETEROJUNCTION: CHLOROFLUOROCARBON:
juicifer's user avatar
  • 10.8k
9 votes

An overcomplicated Boat Puzzle

I have a completely different answer. I'm not sure if I'm reading too much into the wording or if this is the real intention of the question. Because What is the fewest number of crossings required ...
SkySpiral7's user avatar
8 votes
Accepted

Cross the river with a small (4 spaces) boat

They can make it like this: First trip: Second trip: Third trip: Fourth trip: Fifth trip: Sixth trip: Last trip: And they are all across the river with no-one dead or fighting. How I got this:...
Beastly Gerbil's user avatar
8 votes

River Crossing Puzzle

It can be done in a total of as follows.
Rand al'Thor's user avatar
7 votes

Ali Baba and the 10 thieves

UPDATE: UselessInfoMine noticed that Glorfindel’s seemingly optimal solution didn’t actually work. Here’s a working version with the same crossing count. ————— Glorfindel’s approach seems good. Here’...
Bass's user avatar
  • 77.4k
7 votes

Another river with some extra letters

No lateral thinking tag, but still: The other solution is for them to:
Amit Naidu's user avatar
  • 2,009
6 votes

Another river with some extra letters

Skipping the usual lateral thinking answers, here's a more unusual one:
Bass's user avatar
  • 77.4k
6 votes

Another river with some extra letters

It may be trivial as an answer, but Alternatively
tom's user avatar
  • 4,261
6 votes

Another river with some extra letters

While I will defer to puzzledPig's answer as the better one, I would also propose that:
Phylyp's user avatar
  • 9,160
6 votes

Another river with some extra letters

PuzzledPig's solution only works if a certain precondition is met. Here is a more general solution. If both men are on the same side of the river, If not,
Swiss Frank's user avatar
6 votes

The cat exchanges places with a drawing of the cat

This is solvable in seven nine* moves, using the dictionary file /usr/share/dict/words that coms with Ubuntu 18.04. Code below, in TXR Lisp. To find the shortest ...
Kaz's user avatar
  • 436
6 votes
Accepted

A frugal canal-crossing

The five-passenger boat is obviously possible, as you can simply bring every animal in one trip. The four-passenger boat is The three-passenger boat is The two-passenger boat is The one-passenger ...
juicifer's user avatar
  • 10.8k
5 votes
Accepted

3 cannibals and 3 missionaries on different side of the river

JS1's user avatar
  • 17.9k
5 votes
Accepted

Missing lattes and mutually mistrustful words

4 intermediate steps (thanks @ace) 6 intermediate steps
Omega Krypton's user avatar
5 votes
Accepted

Terrorists transporting Hostages through the desert

My try: I will assume that, in the rule "if there are more hostages than terrorists in one Hideout...", it doesn't count if there are no terrorists in that Hideout. Otherwise the game is simply ...
WhatsUp's user avatar
  • 7,387

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