1. Put the 'Player' tag on your playermodel
2. Give you playermodel an
   1. Rigidbody
   2. Collider
3. Create and object you want to collide with
4. Give it a collider and check "Is Trigger"
5. Put the SwitchScene.cs script onto the (teleport) object
6. Fill in the index you are in (you can find these in your build settings)

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