Chapter 6 begins in the city, which means you have to locate several collectibles inside the houses or on their roofs.
The first chest can be found after the chapter begins - it is located right next to Adolphus.
Another chest is located on the left - under the fan there is a door you need to open.
After you leave this apartment enter Bolmus' home (on the left at the bottom). Inside it, you can find a chest and a stone.
In the basement, there is a chest on the left.
After you pass the trap, there is a chest waiting for you on the right. Do not open it, unless you want to fight an opponent.
Insite the wall on the right, there is a stone, which has to be broken by Igniculus.
The last chest is in the basement, in from of the lever which opens the way to the exit.
Upon entering the mountain looking like a man's face you will see a stone. To the left of it there is also a chest.
When going down, you find another stone, which has to be broken by Igniculus.
After going down, you need to turn righ at once. Between the traps, there is a stone, and a bit further, there is a chest.
Continue downwards and turn right to find another stone. It is hovering above lava.
Behind the spider on the right there is a chest. Defeat the spider in order to destroy the web and access the chest.
After defeating the boss, fly downwards. On the left, there is a letter - be careful, as it is flying between traps.
Below, there is a chest on the left.
To the right of the last chest you find a door - open it to access a new location. At the bottom, there is a stone and a chest.
In this location, there is one more stone (above lava).
In order to find four chest, you need to solve Robert's puzzle go open go through the door.
After you kill a spider, you can find another chest at the very botton on the right.
Before fighting the spder, you will wind a chest on the left.
The last chest and stone in this location can be found next to the spider, to the left of the boss' arena.