diff --git a/content/posts/newsletter-020/index.md b/content/posts/newsletter-020/index.md
index 12a401afb..7c34ab51a 100644
--- a/content/posts/newsletter-020/index.md
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@@ -304,6 +304,28 @@ on our github.
[adass-talk]: https://www.youtube.com/watch?v=TILtJOiiRoc
[al-test-url]: https://bmatthieu3.github.io/hips_webgl_renderer/index.html
+### [Portal Explorer][portal-explorer]
+
+
+_"Portal in portal" scene_
+
+[Portal Explorer][portal-explorer] by [@optozorax][optozorax-twitter] is a web
+visualizator of mind-blowing portals.
+
+In Portal Explorer you can view how interesting portals are constructed, and
+visually explore their properties by moving and rotating them. This program
+doesn't work well on mobile, better opened from PC. The most interesting
+scene is [portal in portal][portal-in-portal].
+
+Created using ray-tracing in shaders, engine is [macroquad][macroquad-git],
+interface is [egui][egui-git].
+
+[portal-explorer]: https://github.com/optozorax/portal
+[optozorax-twitter]: https://twitter.com/optozorax
+[portal-in-portal]: https://optozorax.github.io/portal/?scene=portal_in_portal
+[macroquad-git]: https://github.com/not-fl3/macroquad
+[egui-git]: https://github.com/emilk/egui
+
## Engine Updates
### [Tetra]
diff --git a/content/posts/newsletter-020/portal-explorer.png b/content/posts/newsletter-020/portal-explorer.png
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