# Extension Help Simplified
**URL:** https://forum.makecode.com/t/extension-help-simplified/42220
**Category:** Help
**Tags:** extension
**Created:** [February 17, 2026, 7:03pm UTC](https://forum.makecode.com/t/extension-help-simplified/42220 "2026-02-17T19:03:46Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@twocircles](https://forum.makecode.com/u/twocircles)
#### Post date: [February 17, 2026, 7:03pm UTC](https://forum.makecode.com/t/extension-help-simplified/42220/1 "2026-02-17T19:03:46Z")
My game’s extension’s “create platformer sprite“ is not working, I put [parameter]? and it didn’t show the + symbol in blocks. [https://arcade.makecode.com/S20253-41197-50944-80804](https://arcade.makecode.com/S20253-41197-50944-80804)
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### Author:  [@twocircles](https://forum.makecode.com/u/twocircles)
#### Post date: [March 29, 2026, 9:39pm UTC](https://forum.makecode.com/t/extension-help-simplified/42220/2 "2026-03-29T21:39:25Z")
Why is this?
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### Author:  [@AlexK](https://forum.makecode.com/u/AlexK)
#### Post date: [March 29, 2026, 9:41pm UTC](https://forum.makecode.com/t/extension-help-simplified/42220/3 "2026-03-29T21:41:59Z")
Visit the documentation for creating custom blocks.
> **[Defining blocks](https://makecode.com/defining-blocks)**
>
> This section describes how to annotate your MakeCode APIs to expose them in the Block Editor.
You also can use the **Blocks Playground** to see examples of different blocks. I’ve linked to the Functions playground since you mentioned parameters.
> **[MakeCode Blocks Playground](https://makecode.com/playground#functions)**
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### Author:  [@twocircles](https://forum.makecode.com/u/twocircles)
#### Post date: [March 30, 2026, 3:16pm UTC](https://forum.makecode.com/t/extension-help-simplified/42220/4 "2026-03-30T15:16:50Z")
Thank you!