Syncing objects in Wobbly Life is quite simple.

Following on from Spawning Prefabs over the network we have a MyBall.prefab which has a rigidbody on it. Now when this object spawns it looks fine on the servers side. However when a client joins the object will be floating in the air.

To fix this we need to attach the component ModTransformSync.cs to the MyBall.prefab

By default it should work out the box and sync the position and rotation only. However you can change these settings for your own needs. Note: You should only tick the boxes which you actually need to save network bandwidth

Now when you play this mod with other people they will also be able to see the ball in the same position as you.