As Indy get on the repaired lift and use your whip on highlighted place. Destroy the cage to free a prisoner who will open the door for you.
Defeat your enemies and go to next room. Take dynamite from the box on the right side and throw it at the pile of LEGO pieces blocking the way. Go through.
In the next room kill guards and go to the right. Destroy a pile of LEGO and take little object. Take it to the left and attaché it in good place. Pull all block and stairs will appear.
Go up and defeat your enemies. Destroy barrels under the cage and you will find a shovel. Dig up the gloving object, attach it to the right place and pull the level. You will free all the prisoners. Defeat enemies and go up and right. Jump to the right and destroy piles of LEGO blocking the way to the tunnel. Go through.
It's time for next boss fight. When you will hit him, a red magician will appear and heal him. You need to kill the healer. Take dynamite from the box and throw it at the prison where the child is. He will be free now.
As a child use the hatch and hit a healer. He will run to the right. Destroy the barrels and you will find a wrench. Repair with it one of the lifts on the right side and jump using this lifts to the right side. Hit healer again and he will run away.
As Indy, push the cart to the right side. Change your character to the child, with the help of cart jump to the platform where the healer is standing. Hit him.
Now you need to take care of main enemy. Notice, that he is lifting big rocks from time to time. It is the correct moment to take a dynamite and throw it at him. Repeat this action and you will finally eliminate him.