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Game development








Hello! I'm Tom. I designed a game called Gunpoint, about rewiring things and punching people, and now I'm working on a new one called Heat Signature, about sneaking aboard randomly generated spaceships. Here's some more info on all the games I've worked on, here's the podcast I do, here are the videos I make on YouTube, here are some of the articles I wrote for PC Gamer, and here are two short stories I wrote for the Machine of Death collections.


By me. Uses Adaptive Images by Matt Wilcox.

Heat Signature’s Launch, And First Player Legend

A Leftfield Solution To An XCOM Disaster

Rewarding Creative Play Styles In Hitman

Postcards From Far Cry Primal

Solving XCOM’s Snowball Problem

Kill Zone And Bladestorm

An Idea For More Flexible Indie Game Awards

Teaching Heat Signature’s Ship Generator To Think In Sectors

What Works And Why: Multiple Routes In Deus Ex

Natural Numbers In Game Design

Naming Drugs Honestly In Big Pharma

Writing vs Programming

Let Me Show You How To Make A Game

New Heat Signature Video: Galaxies, Suction And Wrench-Throwing

What Works And Why: Nonlinear Storytelling In Her Story

My Idea For An ‘Unconventional Weapon’ Game

From Gunpoint To Heat Signature: A Narrative Journey

The Cost Of Simplifying Conversations In Videogames

What Works And Why: Invisible Inc

Our Super Game Jam Episode Is Out

What Works And Why: Sauron’s Army

Showing Heat Signature At Fantastic Arcade And EGX

What I’m Working On And What I’ve Done

The Formula For An Episode Of Murder, She Wrote

Heat Signature Needs An Artist And A Composer

Improving Heat Signature’s Randomly Generated Ships, Inside And Out

Gunpoint Patch: New Engine, Steam Workshop, And More

Distance: A Visual Short Story For The Space Cowboy Game Jam

Raising An Army Of Flying Dogs In The Magic Circle

Floating Point Is Out! And Free! On Steam! Watch A Trailer!

Drawing With Gravity In Floating Point

What’s Your Fault?

The Randomised Tactical Elegance Of Hoplite

Here I Am Being Interviewed By Steve Gaynor For Tone Control

Heat Signature: A Game About Sneaking Aboard Randomly Generated Spaceships

The Grappling Hook Game, Dev Log 6: The Accomplice

A Story Of Heroism In Alien Swarm

One Desperate Battle In FTL

To Hell And Back In Spelunky

Games Vs Story 2

Gunpoint Development Breakdown

Five Things I Learned About Game Criticism In Nine Years At PC Gamer

My Short Story For The Second Machine Of Death Collection

Not Being An Asshole In An Argument

Playing Skyrim With Nothing But Illusion

How Mainstream Games Butchered Themselves, And Why It’s My Fault

A Short Script For An Animated 60s Heist Movie

The Magical Logic Of Dark Messiah’s Boot

Arguing On The Internet

Shopstorm, A Spelunky Story

Why Are Stealth Games Cool?

E3’s Violence Overload, Versus Gaming’s Usual Violence Overload

The Suspicious Developments manifesto

GDC Talk: How To Explain Your Game To An Asshole

Listening To Your Sound Effects For Gunpoint

Understanding Your Brain

What Makes Games Good

A Story Of Plane Seats And Class

Deckard: Blade Runner, Moron

Avoiding Suspicion At The US Embassy

An Idea For A Better Open World Game

A Different Way To Level Up

How I Would Have Ended BioShock

My Script For A Team Fortress 2 Short About The Spy

Team Fortress 2 Unlockable Weapon Ideas

Don’t Make Me Play Football Manager

EVE’s Assassins And The Kill That Shocked A Galaxy

My Galactic Civilizations 2 War Diary

I Played Through Episode Two Holding A Goddamn Gnome

My Short Story For The Machine Of Death Collection

Blood Money And Sex

A Woman’s Life In Search Queries

First Night, Second Life

SWAT 4: The Movie Script

The City That Rarely Enters Sleep Mode

I’m wrapping up this triplet of GTA posts with the one I should have started with: why it’s worth talking about in the first place. I can’t agree with its most frequent criticism – that it’s merely the same game tweaked – because none of the three things that keep bringing me back to it were present in any meaningful sense in its predecessors. Those would be:



Right now I have raw ache in the back of my throat, from laughing. Earlier this evening Tim actually cried. It’s probably the fourth or fifth time three or more of us have piled into the Free Mode map – just GTA sans missions, optionally sans police, and plus de joueurs. And so far it seems like our vocal chords will wear thin before the game mode does.

The objective-based modes are fine, but they’re just fun missions in which you can also do ridiculous stuff. Free mode is based around our own objectives. They don’t have to be particularly well-conceived ones. Tim wanted to know if a bike could jump through the doors of a helicopter. Rob wanted to know how many of us – each with varying Wanted levels – could ride together in a bus. I wondered if we could accurately bail from maximum-altitude helicopters above Central Park and land safely in the lake.

No, all of us, and no. What we did discover was that a helicopter propellor will swat an airbourne moped far enough that, even after the laughter had died down, I was able to truthfully say “Guys, I still haven’t landed.” And that while a bus makes a forceful and hardy getaway vehicle, there’s only so long it can wait for me to fumble with its diabolical automatic door under a monsoon of gunfire and a barrage of unbraking black-and-whites before it really ought to get going. And that, on a breezy day, ensuring your helicopter is geostationary over a large body of water is no guarantee that you’ll land in it when you bail.

Times Square

New York

Liberty City – this Liberty City – is faithful to New York on a level GTA has never tried before. As well as the structure and detail, it captures the character and subtlety of a real place that games struggle to make up.

New York is my favourite place, and having a digital replica lets me explore it in ways I couldn’t even if I lived there. I don’t like to call these things too soon, but I don’t think I’ll ever actually find myself superbiking through Times Square in a thousand dollar suit. I hope I’ll never have to snipe Union workers down by Pier 45. And though the urge to throw myself off the Empire State enters my mind every time I top it, I can’t imagine it would really be as fun as it was in GTA IV. Doing these things gives me a feel for New York I couldn’t get otherwise, even if I spent significantly more on a trip there than I did on this console. It’s a new, cheap, bloody form of holiday.

So Rockstar can’t take all the credit for its exquisite sense of place, looming scale, gently fading ambience, but we get the full effect. It’s a city you can almost smell. So many different parts of it are beautiful in so many different ways, at so many different times. The runway lights at Francis bleeding blindingly into the mist on a foggy morning, Central Park blushing amber at sundown, rain-slick midtown Manhattan festive with red brake lights reflected in the wet tarmac, Times Square mall-bright in the dead of night, and the lazy, immobilising heat buzzing off the cracked streets of Broker on a dazzling day.

Next to the majesty of the city they built to set it in, GTA’s actual game seems puerile and sad. You could write an epic in this place, it could have a force and resonance we’re not used to. Violence could mean something here, it could be shocking again, and provoke something from us. That’s partly why I can’t join the chorus praising Rockstar’s storytelling; an arbitrary variety-show of charicatures, taking turns to step up on a non-interactive stage to tell a meandering story so apparently slave to the episodic mission structure that it’s impossible to believe in. It’s not that it’s worse than a typical game story – nothing is – it’s just unworthy of this setting.

Police AI isn’t the next one. But if you watch my legs adjust to the bounce of the rowboat I’m crouching in, you can see – even through the abysmal video quality – a bit of Euphoria going on.


Traditionally, people in games are acting out pre-recorded animations until they’re killed, whereupon a simple mechanical physics system takes over to simulate how their limp body falls and how it reacts to what it hits on the way down. That means any time a game character collides with something his pre-defined animations didn’t account for, the developers have to decide whether he should fail to react to it at all, or die.

GTA IV is the first major game that can handle the in-between cases. It licenses a piece of witchcraft called Euphoria that can blend physical simulation in with set animations, so that whenever anything hits anyone, they’ll be knocked by it in a physically convincing way, react to it in a humanly convincing way, then return smoothly to one of their normal animations. I have no idea how it works.

Actually, I know almost exactly how it works – anyone who’s thought about this problem for a second since the birth of 3D gaming could tell you how the eventual solution would have to work. The mystery is how the hell it ended up running smoothly on a home console. It’s essentially having to simulate the musculature of the human body in real-time, plug that into a mechanical physiscs system and motion-captured animation, and then make it work on as many interacting bodies as you care to run down in one spree. On a system where some developers won’t use ragdoll because it’s too processor-intensive.

The upshot for the player is the most reactive game I’ve ever seen, and a proper milestone in the progress of game ‘feel’. Both of my other obsessions in this game – our suicidal crash-tests and the intense impression of existing within this city – draw their power from the physicality Euphoria lends to every interaction in the game.

Achievement unlocked: wrote about GTA IV for one thousand words without mentioning the phrases ‘American Dream’, ‘fresh off the boat’, or ‘living breathing city’.


Rob: Chalk up a few more laughs for that video. Right before it loaded I was picturing some kind of Benny Hill type moment.. and there it is.

John: Euphoria really does feel like a step forward in games evolution. The same way that it feels odd to go back to a game without ragdoll, it'll soon feel odd to go back to a game without Euphoria.

J-man: Love the vid, plus does anyone know when and if GTA IV is coming out on PC?

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