(game "N Puzzles" 
    (players 1) 
    (equipment { 
        (board (square <Version:boardSize>)) 
        <Version:pieces>
    }) 
    
    (rules
        (start (place Random {<Version:random>}))
        
        (play (forEach Piece))
        
        (end 
            (if 
                (is Target {<Version:order>}) (result P1 Win)
            )
        )
    )
)

//------------------------------------------------------------------------------

(option "Board Size" <Version> args:{ <boardSize> <pieces> <random> <order>}
    {
    (item "2x2" 
        <2>
        <
        (piece "1" P1 "StepOrthogonalToEmpty")
        (piece "2" P1 "StepOrthogonalToEmpty")
        (piece "3" P1 "StepOrthogonalToEmpty")
        >
        <"1" "2" "3">
        <3 0 1 2> 
        ""
    )
    
    (item "3x3" 
        <3>
        <
        (piece "1" P1 "StepOrthogonalToEmpty")
        (piece "2" P1 "StepOrthogonalToEmpty")
        (piece "3" P1 "StepOrthogonalToEmpty")
        (piece "4" P1 "StepOrthogonalToEmpty")
        (piece "5" P1 "StepOrthogonalToEmpty")
        (piece "6" P1 "StepOrthogonalToEmpty")
        (piece "7" P1 "StepOrthogonalToEmpty")
        (piece "8" P1 "StepOrthogonalToEmpty")
        >
        <"1" "2" "3" "4" "5" "6" "7" "8">
        <7 8 0 4 5 6 1 2 3>
        ""
    )**
    
    (item "4x4" 
        <4>
        <
        (piece "1" P1 "StepOrthogonalToEmpty")
        (piece "2" P1 "StepOrthogonalToEmpty")
        (piece "3" P1 "StepOrthogonalToEmpty")
        (piece "4" P1 "StepOrthogonalToEmpty")
        (piece "5" P1 "StepOrthogonalToEmpty")
        (piece "6" P1 "StepOrthogonalToEmpty")
        (piece "7" P1 "StepOrthogonalToEmpty")
        (piece "8" P1 "StepOrthogonalToEmpty")
        (piece "9" P1 "StepOrthogonalToEmpty")
        (piece "10" P1 "StepOrthogonalToEmpty")
        (piece "11" P1 "StepOrthogonalToEmpty")
        (piece "12" P1 "StepOrthogonalToEmpty")
        (piece "13" P1 "StepOrthogonalToEmpty")
        (piece "14" P1 "StepOrthogonalToEmpty")
        (piece "15" P1 "StepOrthogonalToEmpty")
        >
        <"1" "2" "3" "4" "5" "6" "7" "8" "9" "10" "11" "12" "13" "14" "15">
        <13 14 15 0 9 10 11 12 5 6 7 8 1 2 3 4>
        ""
    )
    
    (item "5x5" 
        <5>
        <
        (piece "1" P1 "StepOrthogonalToEmpty")
        (piece "2" P1 "StepOrthogonalToEmpty")
        (piece "3" P1 "StepOrthogonalToEmpty")
        (piece "4" P1 "StepOrthogonalToEmpty")
        (piece "5" P1 "StepOrthogonalToEmpty")
        (piece "6" P1 "StepOrthogonalToEmpty")
        (piece "7" P1 "StepOrthogonalToEmpty")
        (piece "8" P1 "StepOrthogonalToEmpty")
        (piece "9" P1 "StepOrthogonalToEmpty")
        (piece "10" P1 "StepOrthogonalToEmpty")
        (piece "11" P1 "StepOrthogonalToEmpty")
        (piece "12" P1 "StepOrthogonalToEmpty")
        (piece "13" P1 "StepOrthogonalToEmpty")
        (piece "14" P1 "StepOrthogonalToEmpty")
        (piece "15" P1 "StepOrthogonalToEmpty")
        (piece "16" P1 "StepOrthogonalToEmpty")
        (piece "17" P1 "StepOrthogonalToEmpty")
        (piece "18" P1 "StepOrthogonalToEmpty")
        (piece "19" P1 "StepOrthogonalToEmpty")
        (piece "20" P1 "StepOrthogonalToEmpty")
        (piece "21" P1 "StepOrthogonalToEmpty")
        (piece "22" P1 "StepOrthogonalToEmpty")
        (piece "23" P1 "StepOrthogonalToEmpty")
        (piece "24" P1 "StepOrthogonalToEmpty")
        >
        <"1" "2" "3" "4" "5" "6" "7" "8" "9" "10" "11" "12" "13" "14" "15" "16" "17" "18" "19" "20" "21" "22" "23" "24">
        <21 22 23 24 0 16 17 18 19 20 11 12 13 14 15 6 7 8 9 10 1 2 3 4 5>
        ""
    )
})

//------------------------------------------------------------------------------

(metadata 
    
    (info
        {
        (description "N puzzles are played with tiles within a grid, with one empty space. For instance, in a 4x4 grid there are 15 tiles.")
        (rules "The tiles are each given a number from 1 to n-1. By sliding the tiles into the open space, the object is to placed the tiles in order based on their numbering.")
        (source "<a href=\"https://en.wikipedia.org/wiki/15_puzzle\" target=\"_blank\" class=\"style1\" style=\"color: #0000EE\" />Wikipedia</a>")
        (id "123")
        (version "1.3.14")
        (classification "puzzle/planning")
        (author "Noyes Palmer Chapman")
        (credit "Eric Piette")
        (date "1874")
        }
    )
    
    (graphics {
        (player Colour P1 (colour 210 230 255))
        (piece Style Text)
    })
    
    (ai 
        "N Puzzles_ai"
    )
    
)