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Credits

Each question to Simu uses credits. A lesson that fails to load is refunded automatically.

Your balance…credits

Starter

$4.99

One-time payment

  • 150 credits
  • About 15 lessons
  • $0.33 per lesson

Explorer

Popular

$9.99

One-time payment

  • 350 credits
  • About 35 lessons · 17% bonus
  • $0.29 per lesson

Family

$19.99

One-time payment

  • 800 credits
  • About 80 lessons · 33% bonus
  • $0.25 per lesson

Classroom

$49.99

One-time payment

  • 2,200 credits
  • About 220 lessons · 47% bonus
  • $0.23 per lesson

What credits buy

  • A new question (full lesson)10 credits
  • Changing the current scene3 credits
  • Off-topic or unclear questions3 credits
  • Reading a lesson file5 credits
  • Build & Discover items3–10 credits, once
  • Simu's voice, sliders, draggingFree

Free credits: 30 when you first sign in, and 1 for each discovery question you answer right in Build & Discover.

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