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Analysis: Turn-Based Versus Real-Time
Analysis: Turn-Based Versus Real-Time
November 6, 2009 | By Soren Johnson

November 6, 2009 | By Soren Johnson
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[In this in-depth design analysis, first published in the August 2009 issue of Game Developer magazine, Electronic Arts designer Soren Johnson (Spore, Civilization IV) looks at the myriad factors in the decision to make a game turn-based versus real-time.]

One of the most important choices a designer makes at the start of a project is deciding whether to make a turn-based game or a real-time one. Each type of base game mechanic provides potential benefits and drawbacks.

While turn-based games favor more strategic and transparent play, they can feel a little stodgy to players used to action-oriented titles. Real-time games, on the other hand, are more immersive and multiplayer-friendly but can also easily overwhelm new players if they are not well-paced.

Turn-based games, of course, descend directly from the board game tradition which predates video games. Indeed, the fanbase for turn-based games still overlaps significantly with the fanbase for board and card games. Real-time games (excluding sports) were only truly possible with the advent of computers. Indeed, quite a few games - Super Mario Bros., Team Fortress, FIFA, Pac-Man - could only ever conceivably be developed as real-time games.

However, quite a few games could go either way, with an understanding that each path comes with its own set of trade-offs. Roguelike dungeon-crawlers, for example, have been made as both turn-based and real-time games. Early versions, such as NetHack, were purely turn-based; the game’s clock only moves forward each time the player takes an action.

However, Blizzard’s Diablo put the same explore-and-loot formula into a real-time environment and created an experience that was less strategic but more visceral and potentially addictive. Furthermore, without the waiting inherent in a turn-based system, the designers could develop a viable multiplayer mode.

Nonetheless, Diablo has not supplanted the continuing popularity of turn-based roguelikes, such as Pokemon Mystery Dungeon or Shiren the Wanderer, which maintain their own tactical charm. Thus, deciding between turn-based and real-time is not a question of which system is “better” or “worse” but rather a question of which set of trade-offs best fits the game the designer wants to make.

How Much Stuff?

One simple way to look at a game is by asking how many game systems and elements the player needs to master to feel competent. For example, a typical shooter might have ten weapons; a real-time strategy game might have fifteen units per side; a role-playing game might have twenty spells available. New players can often be intimidated by the sheer quantity of new concepts and options a game presents to them, and the time pressure of a real-time game only makes this learning experience an even greater challenge.

When first prototyping the original Civilization, Sid Meier originally built the game as a real-time simulation. Inspired by Will Wright’s SimCity, he tried to extend the concept to a global scale.

He quickly found, however, that players were overwhelmed by the high number of new game systems they needed to juggle at once. After all, SimCity had no diplomacy, no trade, no combat, no research, and definitely no marauding barbarians. Thus, he changed course and rebuilt his prototype as a turn-based game, and the phrase “just one more turn” entered the gaming lexicon.

Designers always should be aware that each game can only contain so much “stuff” before the center cannot hold, and the experience overpowers the senses. By removing time pressure, turn-based games allow players to adjust the learning curve to their own needs. Veterans can still play quickly, but new players can take their time poking around the interface and thinking through their moves.

Thus, turn-based games are generally more accessible than real-time ones. It is no surprise that many of the most popular casual games are turn-based, from staples like Solitaire and Minesweeper to PopCap’s stable of Bejeweled, Bookworm, and Peggle.

Deterministic or Chaotic Play?

At their core, turn-based and real-time games play to different strengths. One example is the question of whether an experience should be deterministic or chaotic. With the former, success often depends on knowing exactly what the results of one’s actions will be; in Puzzle Quest, for example, the player needs to know that when a row of four skulls disappears, the other pieces will fall in a specific way so that a new column of consecutive red gems might form.

Just because some luck elements are involved - such as the unknown new pieces which fall from the top - doesn’t mean that the player isn’t mapping out an exact series of events in her head. This sequential gameplay is one of the core strengths of turn-based games. On the other hand, chaotic, unpredictable gameplay is a strength of real-time games.

When players first spot a heavy-medic combo in Team Fortress 2, they know that they are probably in trouble, but the sequence of events to follow is so varied that players know it’s impossible to overanalyze the situation. A sniper could kill the medic. An explosion might knock the heavy off a platform. A spy might sneak up behind them. An event on the other side of the map might encourage one side to simply abandon the area.

Real-time games support chaotic gameplay best because, with the added pressure of a shared clock, players are not able to reduce each situation down to a repeatable series of moves and counter-moves.

Multiplayer or Single-Player?

Another divide which defines the different strengths of turn-based and real-time games is whether the focus of the experience is multiplayer or single-player. Generally speaking, multiplayer games work best in real-time wheras turn-based games usually focus on single-player sessions.

Turn-based games, like Advance Wars and Civilization, have only a tiny, hard-core multiplayer audience. On the other hand, real-time games with similar themes, such as Command & Conquer and Age of Empires, respectively, gained much of their popularity from their multiplayer modes.

The reason for this divide is clear - waiting for another player to finish his turn is anathema to fun - so designers looking for a synchronous, multiplayer experience almost always prefer real-time games. However, because no one else is waiting, designers of purely single-player games give themselves the option of using turn-based elements whenever convenient, to either add some spice or allow more strategic play.

For example, the single-player game Fallout 3 allows players to pause real-time combat and enter V.A.T.S. mode to strategize which enemy body parts to target, even displaying the exact probability of success for each possible choice. Similarly, the Baldur’s Gate series is a hybrid model, with real-time combat that pauses depending on certain player-selected events, such as when a character receives damage or a new enemy becomes visible.

Breaking the Rules

Indeed, these games are but a few of the many games that blur the line between “pure” turn-based and real-time systems. For example, what about turn-based decisions with a time limit, such as Madden’s play-calling clock? What about X-Com, with its crunchy real-time strategic shell surrounding a gooey turn-based tactical core? Or the Total War series, which does the exact opposite?

What about Europa Universalis, which is technically real-time but plays out so slowly that it “feels” like a classic, sprawling turn-based strategy game? How about asynchronous Web-based games like Travian, which play out over months instead of minutes, eliminating the time pressure but keeping the multi-player benefits of real-time play?

What about Bang! Howdy, which plays as a typical tile-based tactical wargame, except that each unit’s turns regenerate in real-time? In reality, a vast continuum stretches from one extreme to the other, and most games find a space somewhere in the middle.

Therefore, the most important thing to focus on is not the labels themselves but what types of gameplay they represent. For example, the tower-defense game Plants vs. Zombies is ostensibly real-time, but its characteristics are more in line with traditional turn-based games. Besides being solely a single-player game, the gameplay itself is strictly deterministic, even moreso than many turn-based games.

The map consists of five tracks along which the zombies progress, each with exactly nine slots on which to place defensive plants. Furthermore, the zombies’ behavior is entirely predictable - Pole Valuting Zombies will always jump over blocking Wall-nuts, even if that means falling right into the jaws of a Chomper plant.

The game may look chaotic to an observer, but - like most tower-defense games - the strategic play is built upon predictable enemy behavior. The real-time mechanics simply provide time pressure, not the other qualities usually associated with the format, such as chaotic play or a multi-player mode.

Likewise, Boom Blox is a turn-based game which eskews the usual strengths of the format. In the game, players have a discrete number of throws during which to knock down various block-based structures. Unlike most turn-based games, however, Boom Blox is a very chaotic affair, with unpredictable physics-based game mechanics.

Furthermore, unlike Plants vs. Zombies, in which players’ actions take place on a precise 5-by-9 grid, players of Boom Blox use strictly analog controls to point at the screen and then “throw” the ball with the WiiMote. Chaos theory dictates that an identical series of throws will almost never happen twice in a row.

Furthermore, this unpredictable nature coupled with the very short turns (each only a single throw) makes Boom Blox an excellent multi-player game, a rare feat for turn-based video games. Thus, in the end, deciding whether to make a game real-time or turn-based is less important than deciding which aspects of those formats are most relevant to the overall design. As they say, one needs to learn the rules to know how to break them.


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Comments


Bart Stewart
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Perhaps another point in favor of a turn-based design is that it's a better fit than a real-time design for the asynchronous-interaction social networking architectures of FaceBook or MySpace.



I suspect it's not a coincidence that Civilization appears to be coming to FaceBook.

Roberto Alfonso
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Real time games require full attention from the players, just like an action or a racing game, since you act out of reflexes most of the time. In fact, I would say "real time" and "strategy" shouldn't be used in the same sentence. During real time games, the one with the best reflexes usually win. There is no strategy there...

Adam Flutie
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@Roberto - Just because you are forced to think quick doesn't mean their isn't strategy. However if the players are matched in terms of strategic understanding an RTS can turn into quick reflex games where those that can jump around the interface and master the controls have a better chance at winning.

Carl Trett
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I have to agree with Adam here Roberto. Unless your '...' was meant to label the post as sarcasm.



Sports certainly are both played in real-time and have a massive strategic component. Though RTS players have learned that to be competitive they need to reduce the time it takes to do anything and become very proficient at macroing their strategies as fast as they can. One can argue that though one player may gain advantage if they are faster at macroing, all players will have a pre-thought strategy that they will employ as fast as they can react. The same is true in team based FPS's. Strategy is called out on the fly in these cases many times, and though players have to react in knee-jerk fashion often they know the whole time there are underlining rules that will govern a predicted outcome. Racing games require that the drivers have studied the car's behavior and the track's best routes. Positional strategy is even very apparent in Mario Cart when one player purposefully stays in 2nd place as long as possible to avoid the dreaded Leader-Shell.



I'd say even in real time games, the better strategist will trump the faster interfacer.

Tristan Pilepich
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One huge aspect that is overlooked in this article is the target audience. I would have liked to have seen more analysis on what audience prefer what type of game. I think that would be very interesting.

Ting Chow
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@ Carl: Agreed. One's choices of which units to deploy and where matter more than how well one can optimize the units' usage afterward. There are plenty of scenarios in RTS games that can demonstrate the importance of making good investments over having good reflexes.



Regarding the article itself, it was an interesting read to me. Particularly the information about Civilization; it would be quite difficult to play an RTS game with as many sub-systems as Civilization, without having a bunch of stuff be automated for my convenience (and sanity!). But doing so would likely obsolete the affected sub-systems, so I am glad to see that Civilization ended up being a turn-based game.



The fact that Advance War's multiplayer population is mentioned as being small is slightly disheartening, but I suppose I should be glad that it was mentioned at all. I found Advance Wars multiplayer to be pretty fun and had a grand old time playing it online in multiple formats, even when it took a week and a reminder for me or my opponents to work on our turns =P

John Fiorilla
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I think Advance Wars: Days of Ruin's community is small just because of the online architecture; it's way too unorganized. People can (and do) leave whenever they want to at no penalty. The host can make and upload any map he wants, no matter how unfair it is (Advance Wars' griefers; why they do this is beyond me). It takes a long time to join any matches. Numerous other problems ensure that local multiplayer is unfortunately the only way to go.



Which is disappointing. If the next DS has a modern online gaming system I'll be the first in line to lose to everyone else in the world at Advance Wars.

Roberto Alfonso
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Adam and Carl, I think making a very good move is better than making a quick good move. I understand and have played RTS (with StarCraft and Age of Empire being my favorite games of the kind). However, there are two things I don't like from them: real time forces players to be fast when exploiting mistakes, which leaves only very experienced players to exploit them, and split the playerbase as an average player cannot match the speed of an expert. In TBS you lose time pressure, therefore your can focus exclusively in the field.



I like basketball overall, but the last 2 minutes of the match are usually endlessly boring because of time pressures. At least, that is how I see it.



And I agree with John, the problem with AW: DR is the online structure.

Elliot Green
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Sins of a Solar Empire is a game that looks like, feels like, and is a real time game, but packs lots of strategic features.



A turn based game called Cosmic Supremacy is based in real time, but is processed in turns. This game features fighting around the clock, but people play it and have jobs or attend school. This game feels like a real time game, since I can often suffer defeats because I have not checked my empire for two days.



The reason why I like real time strategy games instead of turn based games is that turn based games are removed from the implementation of decisions. RTS games have the player incorporate how their actions are going to impact robots/etc. Turn Based games have results that are predictable.



For example, in the Battle of Carrhae (http://en.wikipedia.org/wiki/Battle_of_Carrhae), a Roman force that was much larger than the Parthian force was beaten badly. An RTS game would incorporate the factors (the ability of the Parthian archers to avoid the legionares, the inferior Roman calvalry) that lead to the Roman defeat. A turn based game would not be able to model this, and the Romans and Parthians would have a stalemate, which did not happen.


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