# Sequence and Timeline Compose sequential and parallel actions without nesting timer callbacks. [Feature status and language/platform compatibility](https://rustic-game-engine.pages.dev/markdown/reference/compatibility.md) Choose an API to see its signature, parameters, examples and behavior. ## APIs - [Sequence.new()](https://rustic-game-engine.pages.dev/markdown/api/sequence/new.md) - [Timeline.new()](https://rustic-game-engine.pages.dev/markdown/api/sequence/timeline-new.md) - [builder.move()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-move.md) - [builder.to()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-to.md) - [builder.animation()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-animation.md) - [builder.wait()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-wait.md) - [builder.call()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-call.md) - [builder.parallel()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-parallel.md) - [builder.play()](https://rustic-game-engine.pages.dev/markdown/api/sequence/builder-play.md) ## Module guide ## Setup and language support These engine-owned services work in Lua 5.4, Luau, JavaScript, Python, C, C++, C#, Java, PHP, and HTML inline JavaScript. Follow [Use gameplay actions](https://rustic-game-engine.pages.dev/markdown/guides/gameplay-actions.md) to create and attach a script, install external toolchains, and choose the correct language binding. PHP and HTML scripts belong under `ui/`; CSS alone runs no gameplay code. The Calls section uses JavaScript signatures. The function examples below include native syntax for all ten script types, including SDK-specific alternatives and limitations. Attach a JavaScript Object Component script to the specified target and press **Play**. Globals are supplied by the engine. Schedule actions from `Start` or a callback, rather than at script top level. Native languages use typed options and their own builder conventions; see the guide's language bindings. ## Parameters Wait takes finite non-negative seconds. Parallel takes an array of sequence builders. Motion and clip parameters match Tween and Animation. Call takes a short callback. Native construction is Sequence.create() in C/C++/Java/PHP and Sequence.New() in C#; Java waits with waitFor. ## Return and timing Builder methods return the builder; play schedules its action tree and returns a single operation handle. Parallel steps wait for their longest branch. Leftover frame time continues into subsequent steps. ## Behavior and limitations - An anchored Part opens in one second, holds for two, closes in one second and prints closed. - Child tweens capture starting values when reached, after previous actions have run. Timeline is an alias of Sequence. - Build a fresh sequence for each playback when callbacks are present; replaying callback tokens is unsupported. - Empty sequences are rejected. Trees are limited to 4096 nodes and depth 32. Reverse is unsupported on sequence/parallel handles. - C builder storage requires Sequence.destroy after scheduling; playback owns a copy of the action data. - Check script attachment, enabled state and the Console when an operation fails. Asynchronous errors also appear in operation state. Callback exceptions disable the owner and clean up its actions. - Owner destruction, disable, successful reload or Stop cleans up owned actions and subscriptions. Failed reload retains the previous behavior's operations. See [Operation handles](https://rustic-game-engine.pages.dev/markdown/api/operation-handles.md) for controls and lifetime details.