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The MDA Framework (2004) — Three Words Puzzle Designers Still Use
In 2004, a few-page paper presented at an AAAI workshop reshaped the vocabulary of game design. Robin Hunicke, Marc LeBlanc, and Robert Zubek formalized Mechanics, Dynamics, Aesthetics. This piece follows those three words from Doug Church's unfinished 1999 homework, through a GDC workshop room, into the real project Oasis, and onto the shelf we now call Steam.
Yajilin (1999) — A Board Where Two Rule-Systems Were Grafted Together
In July 1999, Puzzle Communication Nikoli issue #86 introduced Yajilin, a hybrid pencil puzzle that grafted the "draw exactly one loop" grammar established by 1989's Slitherlink onto a black-cell-counting rule. It reused the arrow-and-number cell from a puzzle published just before it, Yajisan-Kazusan, and by 2005 had already been adopted, as "Arrow Ring," into the US qualifying round of the World Puzzle Championship. From official Xbox and PS Vita ports to a dedicated 2025 mobile app called Loopr, we trace, with sources, 26 years of this grid's survival.
