There are several wall-related problems on Time Tangled Island :
To open the cave at 831 AD, get the gunpowder from the Great Wall of China.
@ the great wall...
On Time Tangled island, just slip past the falling bricks at the Great Wall. For the falling blocks at Giza on Nabooti island, see the related question.
It depends on which wall it is. Such as on the island Time Tangled where you have to get through the pile of rocks at the top of the mountain next to the viking ship. to get past that wall, you need to find the barrel of gunpowder in a different time period, then go back to the rocks and use it.
The barrel of explosives on time tangled is on the left of the Great Wall of China.
The great wall of China is located on the Time Tangled Island. Hope this helps.
Look under and find the treasure
The gunpowder is in China (1593 AD), by the wall to the right.
It is at 1593 AD on the time device (6 o'clock position).
Go to the Chinese time and win it from a guy standing on the wall with a game
Get the gunpowder from the Great Wall (1593 AD) and then click on the rocks.
Go right, and up on the rooftop, then you can jump left to the other part of the wall.