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Game Design as a Science

In my recent PhD thesis proposal I described how I am going to tackle game design as a new domain for automated discovery.  A key piece of this is figuring out game design might be explained as the kind of knowledge-seeking effort you might expect from science or mathematics.  With successful systems performing discovery (such as Simon Colton’s HR system which contributed some new and interesting knowledge in pure mathematics) and new projects beginning to automate the process of exploring a space of games (such as Julian Togelius’ Automatic Game Design experiment), the idea of mashing these together into a “game design discovery system” seems quite attractive to me.

But hold on a second, game designers don’t often think of themselves as scientists or mathematicians any more often than painters or musician do.  What’s going on here?

Think about the process of exploratory design.  Suppose you know about some established game mechanics and you’ve seen them used over and over by others.  You’ve got a reasonable model of how these mechanics manifest in play and how players relate to them.  Looking for a bit of that prized “innovative gameplay” juice, you take two mechanics you know about (but have never seen together) and mash them up into some grotesque-yet-playable artifact.  You do this not because you know it is going to result in something desirable but precisely because you don’t know what the result is going to be.  It’s an experiment, and you can’t way to see what your friends will do when they play it.

Given your experience with this new artifact and the knowledge of what went into it (as well as your previous experiences building other artifacts with those blocks), you improve your understanding of design, updating your design theory if you will.  Bold experiments set you up for big surprises.  In the context of exploratory design, you have to do some serious creative thinking.

Maybe you really had some other goal when doing this (fame, fortune, or just producing an existence proof that games that include mechanic X without including mechanic Y are too predictable), but that action you took of making the wild combination of known-but-unrelated elements could equally be explained by a thirst for knowledge — that you did it as a literal experiment in a larger discovery process.  Recombination isn’t the only action that fits this model, so do naming and detailing new mechancs and showing where they were unknowningly used in the past (proposing a new element in a taxonomy of mechanics) and coming up with a rule of thumb that helps you predict how one particular class of players might behave when such a mechanic is included in the game with suitable representation (proposing a model that links observable gameplay properties to unobservable design elements).

Certainly, a true understanding of player actions is likely to be as complicated as understanding general human thought, so that’s not going to work in a automated discoverer.  What is more realistic, I claim, is to look at how particular players play particular games.  Maybe, in the context of symbolic rules and mechanics there will be approximate explanations for the choices various players make that is much easier to describe concisely.  That is, I want my intelligent game designer to literally reason about the way an audience reacts to the artifacts it produces (painters and musicians do this too), but I want to scope this reasoning to constructs that are reasonable to represent on a computer.  By feeding human-generated (as well as machine generated) play traces and the symbolic knowledge used to construct the games that were played into the familiar data-in-model-out machine learning tools, I hope my system will come to understand this grounded notion of gameplay.

My system will focus on on the production of symbolic knowledge, but it will produce games too.  The construction of playable games will be the primary medium by which the system is able to experiment, drawing information about human players in from its surroundings.  Unlike an interactive genetic algorithm, the system won’t blindly generate piles of artifacts and ask human players to play all of them (nor will it ask for a super-compressed fitness evaluation in the form of a 0-to-5-star-fun-rating), it will mostly play its own games, given its working knowledge of how different kinds of players act, and reserve the attention of human players for games which represent edge cases or unknown regions in the system’s current theories.  The difference between the results of self-play and the observations of its human friends should guide experimentation towards regions which the system should explore to shore up its personal theory.

Ok, astute audience members, what say you to this?


About the author:  Adam is a PhD student, research scientist, software engineer, musician, artist, and hacker. He has a very special kind of respect for those elegant weapons like lisp (pronounced "scheme") and prolog, for a more civilized age. Read more from this author


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7 Comments

  1. Teale Fristoe
    Posted July 30, 2009 at 8:25 PM | Permalink

    Sounds ambitious :)

    So, what’s the first step? Biped?

    And where can I sign up to be a human friend?

    Also, to be the devil’s (or artist’s…) advocate, how will your system handle the more touchy feely aspects of a game, like graphics? I would even include tuning parameters and the like in here. In my experience, those qualities make a huge difference: even an artifact with interesting and entertaining mechanics will be shunned without the right presentation, and a clunky interface will spell instant rejection. Any thoughts about this side of game design?

  2. Adam M. Smith
    Posted July 31, 2009 at 7:18 PM | Permalink

    @Teale

    While I’m in grad school I might as well do something I couldn’t do anywhere else. Apparently grad school is also the only place you can be a human friend to a robot game designer too. Just hang out in the lab (for a few years) and I’ll get you some experimental games to play.

    Given that abstract mechanics and concrete representation are certainly entangled from the player perspective, my system is going to have to address both. However, with BIPED we found we could do it all within a common language so long as we focused on the board-game-like representation with tokens/spaces/connections. Some mechanics are likely to simply be not compatible with this representation, so they’ll be off limits. However I think there is still a healthy space of games that are reachable given the limited representation layer. I can’t address everything and still expect to finish in a finite amount years (ideally countable on two fingers).

  3. Posted August 1, 2009 at 12:58 AM | Permalink

    Is it possible to represent graphical gameplay things in the abstract? Say, having accuracy of shooting a gun impaired when it is raining or dark. Then you can say you addressed the way graphics might play in the game, without actually implementing graphics.

  4. Adam M. Smith
    Posted August 1, 2009 at 9:13 PM | Permalink

    Sure, table top games (D&D, etc.) have the most complicated combat resolution mechanics that I know of, and their implementation is always filtered down to the written word level before players get to interact with them. Every medium brings something new to the representational possibilities, but I’m not worried that contemporary graphics/animation counts for too much overall.

  5. Alex
    Posted August 9, 2009 at 10:11 PM | Permalink

    Since you are talking about injecting of human-generated genotypes into the population, you might want to take a look at human-based evolutionary computation methods. Players sometimes think about changing the rules of the game while playing it. If you can somehow capture that input you can make a good use of it to speed up the convergence of your algorithm to a good solution.

  6. Sam Robson
    Posted October 4, 2010 at 10:56 AM | Permalink

    Game design is a fascinating field of study and it’s definitely a great choice for a PhD thesis. Very ambitious indeed. Planning to publish somewhere?
    —-
    Sam

    Starcraft 2 Units Guide

  7. Noah James
    Posted November 14, 2010 at 12:35 PM | Permalink

    Game Design is definitely a science. Some of the toughest programming is in game programming. Aside from programming, I have been involved in developing games that mimic real life situations and required mathematical modeling in order to replicate the situation in a virtual arena.

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    […] the past, I’ve written about game design as a new domain for automated discovery, in which one might build discovery systems which uncovered new and interesting knowledge in game […]