There is a barrel sitting on the ground at the right side of the scene. If you take it to 831 AD, you can blast open the rocks in front of the cave.
The gunpowder is in China (1593 AD), by the wall to the right.
To open the cave at 831 AD, get the gunpowder from the Great Wall of China.
Go to the Great Wall of China. Head right and you will see a barrel of gunpowder.
The gunpowder is to blast the rocks blocking the cave entrance at the Vikings time (831 AD). The gunpowder is at the Great Wall of China (1593 AD).
sorry but its impossible
When you have the barrel of gunpowder from the Great Wall of China (1593 AD), you can just click on the rocks at the cave (831 AD) and they will be blasted away.(There is no USE on the gunpowder.)
@ the great wall...
The barrel of gunpowder (lower right at the Great Wall of China, 1593 AD) is used to blast open the cave at the Viking island at 831 AD (2 o'clock on the time device).
The gunpowder from the Great Wall of China (1593 AD) is used to blast open the cave at 831 AD, which is blocked by rocks. (see related question)
The cave rocks can be blasted away with the barrel of gunpowder from the Great Wall of China (1593 AD, 6 o'clock on the time device).
The gunpowder from the Great Wall of China (1593 AD) is used to blast open the cave at 831 AD, which is blocked by rocks. (see related question)
There is a barrel of gunpowder at the Great Wall of China (1593 AD). You can use it to blast open the rock cave at the Vikings island in 831 AD. One you have the gunpowder, click the rocks to blast them open.