I always love developers showing their working, and none more so than Valve. Here are ten dense minutes on the teleportation mechanics in Half-Life: Alyx. I like this because you're not just seeing some opinions; they're showing glimpses of the research and testing that informed those opinions, as well as early prototypes, coupled with being a studio with some really deep time invested in VR; it's fascinating seeing them come to their conclusions. Also, as ever, I love seeing how bit a role sound is in presence.

"The voice in Dear Esther doesn't tell you where to go – it only reads, at set moments, from a random selection of letters to Esther as you wander over a deserted and increasingly disrupted Scottish island. The letters are randomised, so no playthrough is the same, and a fragmented narrative of a car crash, a grieving man and a stolen library book is glimpsed but never resolved. When I asked Pinchbeck whether this strictly constitutes a game, he said that it was a game engine, a nice distinction in both senses." Dan fills in his Wired piece on Dan Pinchbeck with some supplementary material. It is very good.

"With Half-Life and Counter-Strike, and more recently Team Fortress 2, we've learned that we're no longer making stand-alone games but creating entertainment services. With Left 4 Dead we're extending that tradition by creating additional gameplay and releasing our internal tools to aspiring developers so they may also create and distribute new Left 4 Dead experiences." Lots of places have the news; this quotation is the killer, though. "Entertainment services". GAAS, anyone?

"What's So Great About The Wire?", a course at UC Berkley. Given the comparisons they suggest, to leave out any of Series 2 from their studies is, frankly, criminal.

"On Tuesday we shipped an update that added a bunch of features / bugfixes / balancing tweaks that came out of the community's feedback. In particular, it made some changes to the underlying TF damage system, and as part of that, it modified the way critical hits are determined. We thought it might be interesting to dig a little into the change, and hopefully give you some insight into our thinking." Another cracking example of explaining game mechanics clearly and directly, to an engaged community.

"You've got to get shit happening – you can talk about it, you can write it down, it means nothing until you actually make it and think f**k that's nothing like what I thought it was going to be! That happens most of the time." Gary Penn on prototyping, getting real, and how they do stuff at Denki. More good stuff.

"We always start with the idea of toys," says Ralfe. "They're the quickest way into finding fun. Rules aren't fun, so we never begin with them." Great feature from Keith Stuart on a visit to Denki; lots of good stuff in here.