You want to sort a sequence of numbers into ascending order. You can perform flips: take a sub-sequence of 4 numbers (a, b, c, d) and reverse their order to obtain (d, c, b, a). Can you sort the following sequence in 9 flips? 9 8 7 6 5 4 3 2 1

My prefix is a print My infix expresses frustration My suffix is often exclaimed My whole goes one step at a time

With a - and +, I am to the left. With a switch, I am a name. With 2 I have fixed. With a -, I am 0. With 0, I run. What am I?

Each side of a standard 6-sided die is painted with a different color. A 6x6 grid is drawn on paper and the die is placed in one of its corners. At each turn the die can be rolled to an adjacent cell (horizontally or vertically). As the die is rolled, the color of its bottom side is imprinted on ...

A group of people In Corsica Carry out a chemistry measurement Which turns out to be highly acidic What is that?

This puzzle is another study for a (hopefully) upcoming puzzle, which I think has an interesting solution path. This puzzle contains a Nurikabe and a Kakarasu (see a previous puzzles for details). The connection between the two is simple: for each clue in the Nurikabe, if the corresponding square...

You and your friends are playing a computer game (numpad to move!) and need to unlock a special character! To do so, the game has given you a clue and a dialog box to enter the codeword. If you get the codeword correct, you unlock the character! Clue: 7419635 14789523 14789635 74123 Enter Codewor...

My prefix is a circle made My suffix is when you get paid My infix tells you what I said. My whole is a wish you made.

You must add red, green, blue and yellow light bulbs to the grid to satisfy these rules. Each white hex must contain either a red, green, blue or yellow light bulb. Light bulbs of the same color cannot be in neighboring hexes. Each white hex must be lit by all four colors of light. This includes...

Let's have the following numbers. √6, 3, 409, 11525, √7, 4661, 1082, -19 What are the relations between these numbers? From what connections have these numbers been created?

My prefix tells things that's true. My suffix if famous will have fans. My infix is what my suffix do. My whole an element of the plan.

Go ahead, count ’em:   2 2 2 1 1 9 In order, 3 instances of digit 2 are followed by 2 instances of digit 1, and 1 of digit 9. This counting would match the digits themselves if only the counting began with 2 rather than 3. These digits do match, blandly:   2 2 2 2 They may be count...