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Migrating from Scratch

MistWarp can run most Scratch projects with enhanced performance and additional features.

Project Compatibility​

Supported Features​

  • All standard Scratch blocks
  • Custom blocks and procedures
  • Most extensions
  • Sprites, costumes, and sounds

Enhanced Features​

  • Faster execution
  • Additional extension APIs
  • Custom stage sizes
  • Developer tools integration

Loading Scratch Projects​

  1. Download .sb3 file from Scratch website
  2. Open MistWarp at warp.mistium.com
  3. File → Load from your computer
  4. Select the .sb3 file

Notable Differences​

Technical Changes​

  • Default sprite is "Misty" not Scratch Cat
  • No cloud variables (local execution only)
  • Enhanced JavaScript extension capabilities
  • Modified virtual machine for better performance

Developer Features​

  • Browser console access for debugging
  • Extension development APIs
  • Custom block creation
  • Performance monitoring tools

Troubleshooting​

Common Issues​

  • Project won't load: Check file format (must be .sb3)
  • Missing blocks: Some custom extensions may not be available
  • Performance differences: Turbo mode may change timing behavior

Solutions​

  • Use "Load from Scratch website" for compatibility issues
  • Check browser console for error messages
  • Disable turbo mode if timing is critical

Next Steps​