diff --git a/README.md b/README.md
index cfbe012..002c62c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # What every scientist should know about computer architecture
 
 ## Introduction
-  - [Puzzle](puzzle.ipynb) ➔ [read-only rendered notebook](https://nbviewer.org/urls/git.aspp.school/ASPP/2024-heraklion-comp-arch/raw/branch/main/puzzle.ipynb)
+  - [Puzzle](puzzle.ipynb)
   - Question: how come that swapping dimensions in a for-loop makes out for a huge slowdown?
   - Let students play around with the notebook and try to find the "bug"
   - A more thorough [benchmark](benchmark_python/)
@@ -16,6 +16,9 @@
 Two exercises to activate the body and the mind
 
 Common goal of both exercises is to sort a deck of tarot cards by value
+
+Before starting, make yourself acquainted with the meanining and the power of the tarot cards. Carefully read [this booklet](https://aspp.school/wiki/_media/tarot-runic.pdf)
+
 ### First experiment: human sorting
 Setup:
 - 1 volunteer to keep the time spent sorting
@@ -75,7 +78,7 @@ Setup:
 ## A final exercise to put it all together
   - fork this repo to your account and clone your fork on the laptop
   - create a branch `ex` and switch to it
-  - work on the [exercise](exercise.ipynb) ➔ [read-only rendered notebook](https://nbviewer.org/urls/git.aspp.school/ASPP/2024-heraklion-comp-arch/raw/branch/main/exercise.ipynb)
+  - work on the [exercise](exercise.ipynb)
   - push your solution to your fork and create a Pull Request to this repo
 
 
diff --git a/architecture/README.md b/architecture/README.md
index eefadfc..699660a 100644
--- a/architecture/README.md
+++ b/architecture/README.md
@@ -37,6 +37,7 @@
   - UTF8 encoded, flexible width from 1B (byte) to 4B (bytes): 1,112,064 Unicode characters (code points)
   - ASCII: 7 bits (fits in one byte), 127 characters ➔ [ASCII table](https://upload.wikimedia.org/wikipedia/commons/2/26/ASCII_Table_%28suitable_for_printing%29.svg)
   - [visualization](https://sonarsource.github.io/utf8-visualizer/)
+  - actually in Python strings (more precisely: unicode objects) are stored in different formats depending on which characters are stored for memory efficiency. Look at the gory details [here](https://docs.python.org/3.14/c-api/unicode.html) ➔ not for the faint-hearted!
 
 - **hexadecimal notation**:
   - base16 ➔ '0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f'
diff --git a/visuals_for_game_source.docx b/visuals_for_game_source.docx
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