The AI

A player alone at a board plays the AI. It picks a target with the same rule knowledge a person has, then throws at it with its own wobble.

The five tiers

Config.AITiers = {
    Noob   = { accuracy = 0.55, power = 0.45, smartCheckout = false, rating = 600 },
    Easy   = { accuracy = 0.68, power = 0.32, smartCheckout = false, rating = 1000 },
    Medium = { accuracy = 0.80, power = 0.20, smartCheckout = true,  rating = 1400 },
    Hard   = { accuracy = 0.90, power = 0.12, smartCheckout = true,  rating = 1800 },
    Pro    = { accuracy = 0.97, power = 0.05, smartCheckout = true,  rating = 2200 },
},

Noob at 0.55 accuracy is roughly a new human player floored at 0.5, which is the point: the easiest AI is beatable by somebody who has never played.

Pro at 0.97 with almost no power error groups tightly on the treble 20. It is beatable, because darts is, but not often.

Smart checkout

The three lower tiers score at the board and finish when they happen to be able to. The three higher ones plan the finish: with 40 left they throw at double 20, with 32 at double 16, and they set up a double they can hit rather than leaving an odd number.

That single flag is a bigger difference than the accuracy numbers. A Medium AI that finishes properly beats an Easy AI that scores better and then cannot get out.

The personas

Config.AIPersonas = {
    { name = "Max",  userId = 156 },
    { name = "Ava",  userId = 2 },
    { name = "Leo",  userId = 3 },
    { name = "Nova", userId = 1 },
},

Four opponents with names and avatars, so a match is against somebody rather than against "AI Medium".

The user ids are what the avatar is loaded from. The shipped ones are very low numbers, which are real, ancient Roblox accounts. Point them at accounts you control, or at least at ones whose appearance you have looked at.

Rating

An AI match is rated against the tier's rating number, so beating Pro moves a player much more than beating Noob, and losing to Noob costs.

That is consistent, and it makes the tier choice meaningful rather than cosmetic. It also means a player can grind a rating by beating a tier slightly below their level over and over, which is true of every ELO system with a chooseable opponent.

If you would rather AI matches were unrated, the hook context carries vsBot; excluding them is a change in the stats service.

Adding a tier

Add an entry to Config.AITiers and it appears as an option. A tier between Medium and Hard:

Tough = { accuracy = 0.85, power = 0.16, smartCheckout = true, rating = 1600 },

Keep rating consistent with the accuracy, or the ladder stops meaning anything.