Diablotin app for iPhone and iPad

Diablotin (also known as Imp, or 15 Puzzle) is a sliding puzzle that consists of a frame of numbered square tiles with one tile missing allowing for movement of the tiles in order to arrange the tiles in an order.

Diablotin can be used in three grid sizes: 3, 4 or 5 tiles in each direction. For additional challenge the increments between tiles can be changed from the standard, 1 to 5, or to a list of prime numbers. The display of the value of the tiles can also be changed from Arabic to Roman, Hex and Alphabetical.

The tiles of Diablotin are normally shown in two colours, arranged in one of up to four patterns seen when the puzzle is solved in the standard formation. The user can select the two colours used in the pattern, as well as the background colour for the puzzle. As of version 1.1.1 two rainbow patterns have been added which will use the two colours selected as start and end points of a generated rainbow using either the HUE or RGB colour space. Rainbow patterns are available only with app upgrade.

Game play starts when the users scrambles up the tiles (via a button, or shaking the device), leaving the user to sort the tiles out into the original formation, or a new formation. As an assistance to the user, the game can provide an on screen hints for the solutions preprogrammed into the game. When a solution is reached, the user can then scramble the grid, or play through to another solution (When playing through, the solution just reached will be subsequently ignored until the grid is scrambled up again. This keeps a user from simply repeating the same solution over and over again...) Solutions go beyond the standard row formations, as solutions range from rows to columns, from diagonal to spirals. Solution deviations like continuous, both ends, odds and evens further expand the range. The game has nearly 200 different solutions between the three grid sizes (not all solutions can be used on any grid, some are only applicable to one grid size only.) With the addition of Sam Loyd Mode (in version 1.1.0) any conceivable solution is now possible...

The user can swipe a tile towards the empty spot, or simply tap on the tile to push towards the empty spot.

When changing grid sizes or Sam Loyd Mode, the tiles will be reset, but when changing how the tile looks, the game will not be reset.

Game Centre is used to keep a running tally of solutions found. This will help combine scores from all your devices.

There are many numerous potential solutions for this game, but I have excluded many as they were not sequentially balanced. Some solutions rely on the last set of numbers being backwards (see Sam Loyd Mode for these!), or an unbalanced change of some sort, and some were not actually a sequence of numbers but a grid of numbers which sums of all the columns and rows matched. If you find a numerical pattern that solves the grid, but the game does not recognize it as a solution, forward the solution to me using the app feedback button. Describe the pattern layout, and send along a screen snapshot, attach in the email). If yours is the first description of the solution, and I include your pattern in a future release, you will get credit for the solution in the release notes.