Collect stuff in all of the times in your time traveling compass and send them to all the correct times. Say, an ancient vase should go to the Greek place/time to that... oracle.
Get the Thor Amulet and Gunpowder from the Great Wall of China
The Vikings (2 o'clock, 831 AD) are stranded because they've lost their Thor's Hammer amulet. Go to the Great Wall of China (6...
There are 11 time locations, and 11 objects that must be swapped between them, each to its correct time. Here are the locations of the items and where they belong.
(see related questions for all...