Since you can't submit a PR for wiki pages, I've provided this patch to fix the URLs. Seems the blog no longer supports the permalinks.
diff --git a/Guides-and-Tutorials.md b/Guides-and-Tutorials.md
index a713b7c..ddb87cb 100644
--- a/Guides-and-Tutorials.md
+++ b/Guides-and-Tutorials.md
@@ -1,6 +1,6 @@
## Introductory / tutorial articles for G3N
-* http://bedroomcoders.co.uk/go-3d-with-g3n-a-rather-nice-3d-engine-for-golang
-* http://bedroomcoders.co.uk/g3n-introducing-the-application-more-3d-with-g3n-and-golang
-* http://bedroomcoders.co.uk/g3n-mouse-picking-and-gui-further-3d-adventures-with-golang
-* http://bedroomcoders.co.uk/exciting-things-ahead-for-g3n-physics
\ No newline at end of file
+* [Go 3d with G3N (a rather nice 3d engine for golang)](https://bedroomcoders.co.uk/posts/128)
+* [G3N introducing the Application more 3d with G3N and golang](https://bedroomcoders.co.uk/posts/129)
+* [G3N mouse picking and gui (further 3d adventures with golang)](https://bedroomcoders.co.uk/posts/130)
+* [Exciting things ahead for G3N (physics)](https://bedroomcoders.co.uk/posts/131)
Since you can't submit a PR for wiki pages, I've provided this patch to fix the URLs. Seems the blog no longer supports the permalinks.