N17: openEtG (#449)

* openEtG December content
* N17: openEtG: Fmt tweaks
* N17: OpenEtG: Fix section order

Co-authored-by: Andrey Lesnikov <ozkriff@gmail.com>

Author: AngelOnFira

content/posts/newsletter-017/index.md

@@ -326,6 +326,28 @@ _Somersaults!_
 [fn-changelog]: https://gitlab.com/silwol/freenukum/-/blob/main/CHANGELOG.md
 [@silwol]: https://chaos.social/@silwol
 
+### [openEtG]
+
+![openEtG login screen](openEtG.jpg)
+
+[openEtG] is an open source engine that is an HTML5 successor to the original
+[Elements the Game][Elements], featuring additional cards and balance.
+In December, 10k lines of JavaScript source were rewritten in Rust:
+
+> Overall I've been brainstorming this change for a couple years. So I'd already
+> shifted from a classical OOP mess with Shield/Weapon/Pillar inheriting from
+> Permanent to one where everything is a Thing. This also made sense because in
+> openEtG there's spells like Flying Weapon which convert the player's weapon
+> into a creature. So before I'd create a new Creature filled in with stats from
+> original weapon, whereas now it's mostly just moving the instance into a
+> creature slot & updating its type tag.
+
+You can read the full openEtG December writeup [here][openEtG-writeup].
+
+[openEtG]: https://etg.dek.im
+[Elements]: http://elementsthegame.com
+[openEtG-writeup]: https://reddit.com/r/rust/comments/k3jy5g/i_rewrote_10k_lines_of_js_into_rust
+
 ### [Weegames][weegames-itch]
 
 ![Four Weegames minigames](weegames.jpg)