One needs to find the number under the car.

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 in a room. One by one, the prisoners are led into the room; each may look in at most 50 boxes, but must leave the room exactly as he found it and is per...

Ten persons are sitting around a circular table according to the following conditions: (i) There are two persons between X and U. (ii) Y is neither adjacent to X nor opposite T. (iii) P and T are adjacent to W. (iv) Q is opposite S who is to the right of V. (v) R and W have four...

My 5yo pupil, Magnus, is playing his first chess tournament. Although I missed his first game, @Elder helped me reconstruct this important first win from the few clues I could collect. Alas, the second round started when I was still reading @Elder useful answer on Puzzling.SE, and I missed the a...

This is my second puzzle here. Hints and tags will be added later if required: G1 B0 A1 A0 B1 A0 G1 A1 E0 A1 B0 C1 B0 A1 E0 A1 A1 A0 C1 A0 A1 A0 B1 A0 B1 A0 A1 A0 C1 A0 A1 A1 A0 C1 A0 A1 B0 A1 A0 A...

(Fairy chess is a general term for any kind of chess variant with pieces that aren't used in the normal game) (Inspired by The Black Prowler (chess)) In this variant, white has their entire army against one black Mastermind. The Mastermind has the following special rules: It can start on an...

My friend is preparing for her upcoming round-the-world trip and is excitedly making lists of places she wants to visit. She sent me a list of her current top 20 destinations. Mostly I see what the names refer to, but there's one that seems ambiguous and I can't figure out where in the world i...

So recently I've learned about fairy chess and I've decided to write a puzzle based around the topic. Today's variation features a chess board which is missing eight squares (A1, A8, C3, C6, F3, F6, H1, and H8). The black squares are missing and thus pieces cannot move to these squares. The pa...

Another fairy chess style match; this is intended to be played with four people. Initially the game is a team based match, with white pieces being one team and black pieces being the other. The rules of team versus team are standard; however, as an example; if both players on team white checkmate...

Okay, it's time to step away from the tag that I may have accidentally revived. I'm here with an interesting number grid: I can't make anything out of it. What's worse, some of the numbers are missing, replaced with black squares. I'm told that one of the squares is wrong, and that the black s...

This is another fairy chess variation and is in the true spirit of Last Man Standing. The idea here is that there are $16$ players (starting as two teams of eight), each with a pawn and a king. The rules are simple: One piece cannot capture another of the same color until the opposing color is ...

I have a problem from Martin Gardner I can’t solve. Please help! For each digit $1\leq d\leq 9$, make 100 using exactly five number of $i$s. Any operation is allowed, brackets as well. For $i=1,2$ I have a solution: $$100=111-11$$ $$100=(2*2*2+2^2)$$ For the rest please help.

Continuation of: "Sub-puzzle: Master and Slave versus Bob the Violent but Honest Psychopath" Continued in: "Master and Slave versus Bob: hard version" Previously I described a game that is played by a Master and Slave team versus Bob the Violent but Honest Psychopath. Here I describe two a...