XP is an out-of-game rewards system that gives you XP (that's short for "experience", or rather an abstraction of it) for, basically, doing certain parts of your Job. For example, you'll earn Janitor XP for using certain tools to clean up pools of puke and blood as a Janitor, and you'll earn them only as Janitor. If you do it as a Medical Doctor or Scientist, you won't earn Janitor XP, even though both jobs regularly involve dealing and working with/in messes.
Earning XP raises your Job level. Your job level is one-fifth of the square root of the total XP you've earned, i.e.
0.2 * √(TOTAL XP). Conversely, by simple algebra, that means to get a certain job level, you need to amass a total of
(LEVEL/0.2)^2 XP. While you're unlikely to earn that much without exploits (and there's no point in exploits given XP's practically cosmetic nature), you can earn only a total of 6000 XP each round and are capped to 10 XP every (roughly) minute.
At certain job levels, you unlock cosmetic, quality-of-life-improving, and/or just plain silly rewards. Some rewards are 0-level, meaning they require no XP to earn i.e. they can be redeemed from the start! Otherwise, XP and Job Level have no other in-game effects; levels don't make you do certain things faster or anything.
XP is also tracked on a BYOND leaderboard. There isn't a reward for being first or top whatever on the leaderboard aside from bragging rights.
Currently, XP is a work-in-progress. More ways of earning XP and more job rewards are being added, and developers are welcome to suggestions. Do not expect skill trees, XP making you faster/more efficient/better at your job, or anything that would significantly affect gameplay in the future.
Which jobs have XP? Job Rewards?
XP is a little strange. Some jobs have XP systems and Job rewards, but some jobs have only Job Rewards and some only XP sytems.
These following jobs have XP systems:
The following jobs have Job Rewards for certain XP levels:
Notice how Captain and Detective have Job Rewards, but no way to earn XP; luckily, all the current rewards are 0-level, i.e. you don't need to have XP at all to unlock them! Notice also how Medical Doctor and Chaplain are in the reverse situation; they have XP systems, but no Job Rewards.
How do I redeem Job Rewards?
You can see your Job XP and Job Levels and redeem the associated rewards via the Check Job Rewards command in the Commands tab.
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