Redblobgames

In 2005 Google showed off Google Maps, which lets you drag the map around instead of reloading the page like MapQuest and others used. That's the feature that got everyone's attention. But what got my attention was a feature they added in 2007 where you c

A few weeks ago I got distracted when I discovered - to my horror - that occasionally the font size on my site was 1.24924375rem instead of the desired 1.25rem. Of course nobody would notice this. But I was annoyed with myself and wanted to figure out why

Although my site isn't designed to fit into the academic world, occasionally an academic paper will cite one of my pages. Everyone uses a different format. That got me wondering if there are is a proper way to cite a web article. The first place I checked

I have sample code on some of my pages. I try to use syntax highlighting when I can, but I don't use it everywhere. In particular, Hexagons guide and Terrain from Noise don't have syntax highlighting. Why? Sample code with no highlighting It's a lot of wo

When I started my web site, we didn't have static site generators or WordPress or GitHub Pages or much else. People wrote HTML1 by hand. Over the years, I've built my own setup to manage my site. My current setup involves writing XHTML that gets transform

(TL;DR: this is a blog post about the process of writing my guide to SDF fonts.) Back in 2024 I learned about SDF (signed distance field) rendering of fonts. I was trying to implement outlines and shadows in a single pass instead of drawing over the text

When a url is posted on a forum/chat, it's often automatically made linkable. But sometimes the regexp that grabs the url also grabs a trailing punctuation mark. For example, if the text is "visit red blob (https://www.redblobgames.com) and scroll to the

It's time for my annual self review. In last year's review I said I wanted to spend time learning things for myself, and less time writing for other people. The main themes for 2025 were: playing with text (very broadly) playing with maps (specifically ma

My "site" is spread across five different servers. I use slightly different CSS on each one. Since 2013 I've been using Sass (SCSS) to manage the variants, using these features: Variables available in CSS since 2020 Calculations available in CSS since 201

I had just wrapped up a project and wanted to do something small/fun before I started the next one. The Flash runtime is being reimplemented in Rust, and I've enjoyed re-enabling the Flash on my site. That had me thinking about my Flash projects again. I