Coming from Roblox

If you have made games in Roblox Studio, most of what you know carries over: KHIM runs Luau, a unit is a stud, gravity is the same, and Roblox's API names still run - game:GetService, Instance.new, Vector3.new, part.Position, :Connect, FindFirstChild, RemoteEvent, leaderstats... KHIM has its own shorter names too, and these docs use them.

The same idea, KHIM's name

Roblox	KHIM
Roblox Studio	KHIM Engine
Place	World (.khim)
Stud	Unit (the same length)
Creator Hub	Workshop
Publish	Go live
Shift lock	Camera lock
Explorer / Properties	Hierarchy / Inspector
Toolbox	Assets panel
Output	Console
Packages	Linked models

Services

Roblox	KHIM	In scripts
Workspace	World	world (workspace works)
ReplicatedStorage	ReplicationService	shared
ServerScriptService	ServerService	game.ServerService
ServerStorage	StorageService	game.StorageService
StarterPlayerScripts, ReplicatedFirst	ClientService	game.ClientService
StarterGui	UI	players.me.gui (a player's copy)
Players	-	players
Lighting	-	lighting
DataStoreService	-	data
CollectionService	-	tags
UserInputService	-	input
TweenService	-	object:tween(...)
HttpService (JSON)	-	json
Teams	-	teams

Classes

Roblox	KHIM
LocalScript	ClientScript
ModuleScript	Module
SpawnLocation	Spawn
Humanoid	Body (character.body)
HumanoidRootPart	RootPart (character.root)
ClickDetector	Clickable
ProximityPrompt	Prompt
BillboardGui	Billboard
PointLight, SpotLight, SurfaceLight	Light
HingeConstraint	Hinge
PrismaticConstraint	Slider
BallSocketConstraint	BallJoint
SpringConstraint, RopeConstraint	Spring, Rope
Motor6D	Bone
LinearVelocity, AngularVelocity, VectorForce	Mover, Spinner, Thruster
ScreenGui	Canvas
Frame, ScrollingFrame	Panel, ScrollPanel
TextLabel, TextButton, TextBox	Label, Button, TextInput
ImageLabel, ImageButton	Image, ImageButton
UICorner, UIStroke, UIPadding	Corner, Border, Padding
UIListLayout, UIGridLayout	ListLayout, GridLayout
UIGradient, UIAspectRatioConstraint	Gradient, AspectRatio
UIScale, UISizeConstraint, UITextSizeConstraint	Scale, SizeLimit, TextSizeLimit
The leaderstats folder	player.stats

The same code, both ways

-- Roblox's names (still run in KHIM)
local Players = game:GetService("Players")
Players.PlayerAdded:Connect(function(player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player
    local coins = Instance.new("IntValue")
    coins.Name = "Coins"
    coins.Parent = leaderstats
end)

workspace.Coin.Touched:Connect(function(hit)
    local player = Players:GetPlayerFromCharacter(hit.Parent)
    if player then
        player.leaderstats.Coins.Value += 1
    end
end)

-- KHIM's names
players.joined:connect(function(player)
    player.stats.Coins = 0
end)

world.Coin.touched:connect(function(hit)
    local player = players.fromPart(hit)
    if player then
        player.stats.Coins += 1
    end
end)

Roblox	KHIM
Instance.new("Part", parent)	new("Part", parent)
Vector3.new(1, 2, 3)	vec3(1, 2, 3)
Color3.fromRGB(255, 0, 0)	rgb(255, 0, 0)
CFrame.new(pos), CFrame.lookAt(a, b)	transform(pos), transform.lookAt(a, b)
UDim2.new(0.5, 0, 0, 40)	dim(0.5, 0, 0, 40)
part.Position, part.CFrame	part.position, part.transform
:Connect, :Wait, :Disconnect	:connect, :wait, :disconnect
FindFirstChild, WaitForChild	find, waitFor
GetChildren, IsA, Destroy, Clone	children, isA, destroy, clone
TweenService:Create(part, TweenInfo.new(1), goals):Play()	part:tween(goals, 1)
RemoteEvent:FireServer(...) / .OnServerEvent	net.send(name, ...) / net.on(name, fn)
RemoteEvent:FireClient(player, ...) / FireAllClients	net.send(player, name, ...) / net.sendAll(name, ...)
RemoteFunction:InvokeServer / OnServerInvoke	net.call / net.handle
DataStoreService:GetDataStore(n):GetAsync(k)	data.store(n):get(k)
UserInputService.InputBegan	input.began, or input.onKey(key, fn)
workspace.CurrentCamera	camera
workspace:Raycast(origin, dir)	world:raycast(origin, dir)
Players:GetPlayerFromCharacter(hit.Parent)	players.fromPart(hit)
humanoid:TakeDamage(10)	player:damage(10)
game:BindToClose(fn)	game.closing:connect(fn)
wait(1), tick()	task.wait(1), time()

KHIM Engine's suggestions follow the script: one written with Roblox's names is offered Roblox's names.

What is different

• No studs on parts. Plastic is a block with eased edges. Roblox's flat SmoothPlastic is KHIM's Smooth.
• Parts weigh their material: a Metal part is heavy, Wood light. applyImpulse divides by the real mass.
• The camera is not an object: it is the camera global in ClientScripts.
• No Attachments. Joints, Beams and movers take an anchor (a vec3 in their part's space) instead.
• Gameplay with no code: Teleporter, Hazard, Checkpoint, Pickup, Boost, Motion, Spawner, Seat - see Touch, prompts and zones.
• Animations are keyframes in your world, made in KHIM Engine's animation editor; Roblox's uploaded animation IDs don't play.
• Sounds and pictures are KHIM's built-in ones or your own uploads (reviewed), named "coin" or "asset:123" - Roblox asset IDs mean nothing here.
• No web requests: HttpService:GetAsync and friends are an error.
• A server Script's change to a Decal, Light or Highlight doesn't reach players: change them from a ClientScript (Sounds, lights and effects).
• Not yet in KHIM: Terrain, SurfaceGui, ViewportFrame, MarketplaceService.

Importing a Roblox world

KHIM Engine can open a .rbxl / .rbxlx world (and .rbxm / .rbxmx models) you made: turn the importer on in the Plugins panel, then File > Import .rbxl / .rbxlx.... An Imported window says what came across and what was left out.

What comes across: parts and their CFrames, sizes, colours, materials; Models and Folders; scripts (unchanged - Roblox's names run); welds; sounds, values, ClickDetectors, lights, ProximityPrompts, particles, decals, highlights, beams and trails; UI; constraints and movers; tags and attributes; Lighting; Teams. Left out: Humanoids, Motor6Ds, Attachments, MeshPart meshes (they become blocks), Terrain, BillboardGuis and SurfaceGuis, Roblox audio and picture IDs.

Only your own games

Publish only worlds you made or have the right to publish. Going live with an imported world asks you to confirm it, and the world is marked as imported. KHIM is not affiliated with Roblox Corporation.