When you lose your phone signal during Chapter 1, take a right and grab the QR code for Kazatelna off the tree.
After Ida calls you in Chapter 1, walk forward under the big horizontal branch to the “green” tree for Spring U Misy.
On the left side of the chapel in Chapter 2.
From the chapel in Chapter 2, follow the yellow path using your phone and the colored markers until you come to a bridge. Turn around and head down toward St. Gorazd Spring. Grab the QR code from the wall you have to climb up.
At Cimburk Castle entrance (Chapter 5). You’ll find yourself there when going from the totem to the castle (look for a map and a signpost, as well as a red ribbon on a tree, then turn around and go up a short hill). Find the code to the right of the door.
Inside Karst Caves (Chapter 5), take the upper right then left path after you cross the stream using your spear.
On the right side of the Hrensko Graveyard chapel (Chapter 7).
At the camp in Chapter 8, take the path to the right of the large green tent and go up the wooden stairs to find the Pravcice Gate code.