Fifteen - licence and credits
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Source: https://github.com/joyrider3774/fifteen_vircon32, commit 84cb48c631f095d0b24d0a381751484ce62c99fa.
Fifteen is the classic sliding puzzle for the Vircon32 console by Davy (joyrider3774), built on the code and art of
the 2048 game by Carra. The whole game is offered under the 3-Clause BSD License (LICENSE and Readme.md of the
repository, "Copyright 2025 Carra & Davy (joyrider3774)"); the text is reproduced below.

Change made by FredyGames: the original gameplay music, adapted from "Chill Air" by Frank Nora, is described by the
author as "downloaded from gamesounds.xyz as public domain", but we could not find a licence from the composer, so we
left it out. In our build the gameplay plays the title music, made by the author (its LMMS project is in the
repository), and the hosted source does not include the removed track. The cartridge was built by FredyGames from
this source with the official Vircon32 toolchain.

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LICENSE of the repository
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    This game is free and open source. It is offered under the 3-Clause
    BSD License, which full text is the following:
    
    Copyright 2025 Carra & Davy (joyrider3774)
    
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    
    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    
    2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
    
    3. Neither the name of the copyright holder nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.
    
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.