How Town of Salem made a mechanic interesting

Town of Salem is a cool game. I just wanted to get it out of the way right now. It's free in browser, give it a shot, you'll have a good time. If you're at all interested in what I'm talking about here, I'm sure you'll have a good time.

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But it's also really interesting to look at what makes this seemingly simple game tick, and how something as simple as being immune to death at night adds layers upon layers of complexity. If you've ever played mafia, ToS is basically like that, but a bit more complex, taking advantage of it being digital, and having more roles.

Now, being night immune is a trait shared by several roles in the game, such as the serial killer and the godfather. If you haven't played or if your memory is fuzzy, it means you can't be killed at night through conventional means. That means no mafia killing you, no serial killer, and no vigilante. Let's take a closer look at what this means for the game as a whole:

It increases the value of certain roles

There are specific roles that can kill through night immunity. The Jailor, Veteran, Werewolf, and Arsonist all have the ability to ignore this attribute and just kill anyone they want at night. Obviously that's a powerful tool for whatever role has it, but it's not without downsides. The jailor is obscenely powerful, but to compensate they're always in the game and are the number one target for pretty much every killing role. The veteran can't actively kill, and can only react to other night immune roles coming to visit them. And of course the arsonist and werewolf are alone, and can't risk being found out or killed or else they lose.

When you give a role such a powerful tool, you're forced to give them downsides, and in doing so each role is just really interesting. You need to play more carefully as a jailor. It's common to try to bait people to visit you as veteran. This mechanic changes every role it applies to, and it makes the game much more interesting as a result.

It's a key strength AND weakness

Night immunity just sounds like a straight strength, no? It certainly is a necessary one for many of the independent roles. The neutral killing roles, for one, are a target of literally every other player in the game, and your "team" is made up of only yourself in this case. It'd be far too easy for you to automatically lose by a random killing if you didn't have night immunity in this case. The town can rely on their numbers, the mafia can afford a loss, vampires can make more of themselves, and so on. Every role has some sort of failsafe, and in the case of these solo roles their failsafe is just flat out being unable to be normally killed.

However, this isn't just a flat buff in these evil roles. Again, it makes the game more interesting, because the party that tried to attack you will know you're night immune. And that's pretty much always a bad thing. If you're neutral killing, mafia and town both want your blood and will out you the next day or in a death note. If you're the godfather, everyone but mafia wants you gone. In these cases, it means you've been put at a disadvantage but still have several options to get out of this mess, rather than just an instant failsafe.

And it's not as simple as "lynch the immune" for the town roles, either. The survivor and bodyguard both have the ability to assume temporary night immunity, so they can't just go about lynching everyone like this.

This is really, really good multiplayer design. I often see a lot of games stumble in providing interesting options on all sides. Take a sniper rifle in any FPS. Typically your options boil down to "get out of sight or die" and the sniper's options are "keep at range or die". It's just not as interesting when each weapon or mechanic gives a very binary state: play this way or fail. Town of Salem keeps it open, even when something bad or good happens to you. Getting found out as night immune isn't an immediate failure, and finding a night immune isn't an instant success. As a result of this it's also not a straight, boring buff to a class to help it work. It's a dynamic mechanic that helps them do their jobs.

It also works as an unknown

Night immunity is always going to be present in a typical game of ranked. The godfather and a neutral killing role will always be in there, so the killing roles will always have this mechanic to work with. That uncertainty means that night immunity is something every role will want to know about for different reasons.

The mafia will usually want to know who's immune so as to not waste nights to kill, and seeing as they're the only factions guaranteed to have someone able to confirm of someone is immune, it's often in their best interests to reveal who's immune through indirect means. It's a question of risk vs reward, typically. Is it in the mafia's best interest to leave roles that can usually kill them alive to see if they'll get the town first. That question doesn't have a clear answer and must be answered per game, and that's great.

On the other hand, every role with permanent night immunity is an enemy of the town, and a massive red flag that this is likely a bad person. It becomes a goal of leveraging every piece of info you get and then putting it into action, as town usually takes control of the lynchings. If it's not coming from the mouth of an investigative role or vigilante, however, it's typically suspect. This turns the simple act of trying to find the evils into a mad scramble to see who can be trusted and what info is good and it's just great.

The point I'm getting at here is that Town of Salem weaves this one gameplay mechanic through the entire game very well. So many multiplayer games keep mechanics isolated and single use. You can only use the grappling hook for mobility. This shotgun only has one use: close range combat. The mechanic of night immunity is not a one and done mechanic only applying to certain scenarios. It's used across the entire game and has repercussions far more than it appears at first. Not every game needs to do something like this, but it's certainly a valuable tool to keep in mind.