I have four coins, all of which are United States currency, on my desk. Some of these coins are face up, and the rest are face down. I know the following facts about the four coins: 1) Each of the four coins is just less than 2 centimeters in diameter. 2) The oldest coin of the four is from 198...

Here is a riddle for all you science nerds out there! Each clue will give you a word or chemical. Tell me how these link together. Clue 1: Work out the chemical and take its atomic symbol part 1: strong metal, to do with wolves part 2: electrons are equal to sqrt(7225) part 3: named in the sam...

Tried to make something clever, but it didn't work out so you're getting a vanilla masyu instead. Normal masyu rules apply.

A little selfmade encryption riddle: Whenever I'm searching for a solution, I have this feeling, like standing on a single point. While I take a step forward, I have the feeling I'm falling two steps behind. It never matters how far I go, in the end I always stand where I started. Can you solv...

People tend to think of me as being small. However I can be confused with an imaginary large being. It has been said a saint got me right between the eyes, perhaps, next to America. I persistently worry when I move about the snake's head. In the West, I am a wealthy and influential bus...

I've designed a set of dominoes puzzles that I call Donimoes. You slide the dominoes like the cars in Nob Yoshigahara's Rush Hour puzzle, always along their long axis. The goal of Blocking Donimoes is to slide all the dominoes into a rectangle, without sliding any matching numbers next to each ot...

If I'm real, you want me. If I'm not, I'm a lie. If I'm real, you'll eat me. If I'm not, I'm batter. You might eat me raw, though not healthy. You might eat me baked, still not healthy. You might want me now, but it's not the time. You might want to celebrate, it's finally tim...

This is a Slitherlink puzzle, being played on the surface of a 3D object, a Rhombicosidodecahedron. If you are not familiar with Slitherlink puzzles, I don't suggest starting on this one. The solution is unique. I am able to solve this puzzle on a single sheet of paper, which is to say there i...

I've been sent this yesterday with no info and I'm so confused. Can anyone tell me what the message is? Seh gdyla wdhjh, seh qhun alts bhn hqhunxyh plt axxbdyf gxu plt yhqhu gxryi lyi tx seh wrmmah khjlzh rytxaqlkah. Pdsedy sexth pex jelaahyfhi ds, sexth ghp gduts, plt yx axyfhu l yhhi gxu jdweh...

The two distinct sets of numbers below exhibit a pattern from the same kind, similar,but at the same time somewhat contrasting and a bit different to each other,one set is complete, the task is to recognize the pattern and logic, and complete the incomplete set

You find yourself trapped in a dark room. You say, "hello" and bright lights turn on, flooding the area. You see a piece of paper on the ground: VIG: e(d(innby, eauuu), innby) You also see a keyboard on the ground with wires heading towards the only door in the room. With no luck, you try to pu...

I have a simple grid puzzle: Example: | X | Y | X | | Y | X | Y | | Y | X | Y | The move is defined as a row or a column move. So when you move one cell, whole column/row moves. Example top row right 2 steps: 1 step | X | X | Y | | Y | X | Y | | Y | X | Y | 2 step | Y | X | X |...

Ann and Bob play alternately on a pile of chips. On each play, either 1, 2 or 3 chips can be removed except if the number of chips is a prime number. In that case either 1, 2, 3, 4 or 5 chips can be removed.The person, who removes the last chip is the winner. There are 100 chips on the pile. Ann ...