PuzzleManiak: It's demoniak

You are given a map consisting of a number of regions. Your task is to colour each region with one of four colours, in such a way that no two regions sharing a boundary have the same colour. You are provided with some regions already coloured, sufficient to make the remainder of the solution unique. [...]

A number of balls are hidden in a rectangular arena. You have to deduce the positions of the balls by firing lasers from positions on the edge of the arena and observing how they are deflected. Lasers will fire straight until they hit the opposite side of the arena (at which point they emerge), unless [...]

You have a square grid, which is divided into as many equally sized sub-blocks as the grid has rows. Each square must be filled in with a digit from 1 to the size of the grid, in such a way that: * every row contains only one occurrence of each digit * every column contains [...]

You have a grid of covered squares, some of which contain mines, but you don’t know which. Your job is to uncover every square which does not contain a mine. If you uncover a square containing a mine, you lose. If you uncover a square which does not contain a mine, you are told how [...]

The computer prepares a network by connecting up the centers of squares in a grid, and then shuffles the network by rotating every tile randomly. Your job is to rotate it all back into place. The successful solution will be an entirely connected network, with no closed loops. As a visual aid, all tiles which [...]

You have a square grid; each square may contain a digit from 1 to the size of the grid, and some squares have greater-than signs between them. Your aim is to fully populate the grid with numbers such that: * Each row contains only one occurrence of each digit * Each column contains only one [...]

You have a grid of squares, with numbers written in some (but not all) of the squares. Your task is to subdivide the grid into rectangles of various sizes, such that (a) every rectangle contains exactly one numbered square, and (b) the area of each rectangle is equal to the number written in its numbered [...]

You are given a grid of dots. Your aim is to draw a single unbroken loop from dot to dot within the grid. Some of the square spaces between the dots contain numbers. These numbers indicate how many of the four edges of that square are part of the loop. The loop you draw must [...]

You have a grid of squares, some of which contain digits, and the rest of which are empty. Your job is to fill in digits in the empty squares, in such a way that each connected region of squares all containing the same digit has an area equal to that digit. (‘Connected region’, for the [...]

You have a grid of squares, some of which contain trees. Your aim is to place tents in some of the remaining squares, in such a way that the following conditions are met: * There are exactly as many tents as trees * The tents and trees can be matched up in such a way [...]