> For the complete documentation index, see [llms.txt](https://docs.siminsights.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.siminsights.com/quickstarts/for-authors.md).
# For authors
Build your first 3D simulation in HyperSkill Studio, or your first Spark.
There are two kinds of simulation to build, and they are built in different places.
* **3D simulations** are built in **HyperSkill Studio**, in a browser or on Windows. A learner moves around a space and handles objects. Covered in depth under [HyperSkill Studio](/hyperskill-studio-authoring.md).
* **Sparks** are conversational simulations, built in the browser. A learner talks with an AI character and is scored on the conversation. Covered under [Spark](/spark.md).
You can find a detailed video tutorial in our [YouTube playlist](https://www.youtube.com/watch?v=ziAevzrFMDI\&list=PLJbp-d55DdDgoPCWtMcsSpdBEVCczp7oP).
## Build a 3D simulation
{% stepper %}
{% step %}
### Open HyperSkill Studio
In HyperSkill Platform, open [**Get HyperSkill**](https://platform.siminsights.com/settings/downloads). **HyperSkill Online** runs in your browser with nothing to install; **Windows Desktop** is the installed app. See [Get HyperSkill on your devices](/start-here/get-hyperskill-on-your-devices.md).
{% endstep %}
{% step %}
### Create a simulation
Select **Create New Sim** in the top right corner of the My Sims page, which opens by default when you launch the app.
{% endstep %}
{% step %}
### Name it and pick a space
Give the simulation a name, select a virtual space from the list, and click **Create** in the bottom right corner.
{% endstep %}
{% step %}
### Author the simulation
The simulation opens in edit mode. Move the camera with the same controls a learner uses, drop objects into the space from the asset library, and use the tabs along the top to add tasks, rules and scoring.
This is the part with real depth to it. [Authoring a simulation](/hyperskill-studio-authoring/authoring-a-simulation.md) covers building the steps a learner follows, making objects react to what they do, and scoring their performance.
{% endstep %}
{% step %}
### Save and play
Click the save icon to save your changes, then press **Play** to enter experience mode.
{% endstep %}
{% endstepper %}
## Build a Spark
{% stepper %}
{% step %}
### Create the Spark
Go to [spark.siminsights.com](https://spark.siminsights.com), sign in with your HyperSkill account, and create a Spark.
{% endstep %}
{% step %}
### Build the conversation
**Scenario Flow** is the states the conversation moves through, **AI** is the character and the agents that score it, and **Settings** covers the microphone.
[Building a Spark](/spark/building-a-spark.md) covers writing the character's instructions, giving it documents to draw on, and setting up the agents that score the conversation and the feedback the learner sees at the end.
{% endstep %}
{% step %}
### Try it
Press **Open experience** to play it as a learner would.
{% endstep %}
{% step %}
### Publish
A Spark cannot be played outside the editor until it is published.
{% endstep %}
{% endstepper %}
to save your changes, then press **Play** to enter experience mode.
{% endstep %}
{% endstepper %}
## Build a Spark
{% stepper %}
{% step %}
### Create the Spark
Go to [spark.siminsights.com](https://spark.siminsights.com), sign in with your HyperSkill account, and create a Spark.
{% endstep %}
{% step %}
### Build the conversation
**Scenario Flow** is the states the conversation moves through, **AI** is the character and the agents that score it, and **Settings** covers the microphone.
