Yeah, I'm currently obsessed with selfmates. Here's one where it's just three Black pieces against the entire White army. I named this puzzle "The Slaughterhouse" for a reason. It's Black to move and selfmate themselves in 18 moves. Naturally, White chooses to the delay the selfmate for as lo...

This is not a location, but if you specifically spelt me with an 's' you would spot me in several bedrooms. I could go on, but I feel that's enough of me for now. What am I?

I make billions (#3) My products are quite edgy, But most have been a bust, I'm only one of many, Lord knows who we can trust, I'm not a politician, Yet I work with presidents, And like a mathematician, I seek proofs of excellence, I resemble a detective, Who f...

I was an avid reader of Popular Science magazine. In the last page or so, they usually had visual clues without words to make useful stuff. I always wanted to create a mathematical puzzle like that with no expressions. Let us see whether I succeeded. Sometimes, I do not wear puzzle solvers hat...

The villages Arriba and Abajo together have 2019 inhabitants. At the annual festival are more than 2000 villagers this year. When they form a huge circle for dancing, everyone calls happy: "I'm dancing between one from Arriba and one from Abajo!" The people from Arriba ar...

Don't mind me, just dropping this nonogram here.

N > 1 people sit in a circle clearly seeing all others. They are going to be blindfolded and, while in this state, hats are put on their heads - one per person, naturally. On each hat there is written a number from 0 to N-1. The numbers may be different or some may be equal. Nothing is known abou...

This simple series is based on my initial (less than 30 ) digits of my signature. Please remember me too and find the missing digits marked X.

ACROSS 5 God of agriculture 8 Time travel 14 Not in Australia... 16 A friend of mine and 800 suns 17 Still growing... 18 Proposed capital Lambda 19 56 + 36 + 3(0) DOWN 1 Nearest to our G-dwarf 2 This is really a powerful pit ! 3 Prefix of an element and a ship. ...

Any ideas on how to solve this matrix?

The formula $HE=\sqrt(SHE)$ translates in German to $ER=\sqrt(SIE)$. Find the solution for both, where each letter represents a digit.