add notices to those who wish for a greater challenge

We add the following level-3 header to help people identify text
they may wish to skip if they wish for a greater challenge:

```
```

After that notice we add:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program via the source.

If you get stuck, come back and read below for additional hints and information.
```

And sometimes follow with:

```
```

Or sometimes follow with:

```
```

Where the alt code impacts a "greater challenge", we add instead:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program without looking at the Alternate code.

If you get stuck, come back and look at the Alternate code.
```

And where a given command impacts a "greater challenge", we add instead:

```
**If you want a greater challenge, don't read any further**:
just try to understand the program without running the command below.

If you get stuck, come back and run the following command:
```

Perform `make www` to perform the above and test under macOS.

1995/leo/README.md

@@ -254,6 +254,19 @@ Special thanks:
 [isotopes](https://en.wikipedia.org/wiki/Isotope).
 
 
+### NOTICE to those who wish for a greater challenge
+
+**If you want a greater challenge, don't read any further**:
+just try to understand the program via the source.
+
+If you get stuck, come back and read below for additional hints and information.
+
+
+### Secret switch
+
+See [secret.html[(secret.html) for a bit if secret switch information.
+
+
 <!--
 
     Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.

1995/leo/index.html

@@ -550,6 +550,12 @@ even want to explain what it does. You’ve been warned!</p>
 <li>to <a href="https://en.wikipedia.org/wiki/Hydrogen">Hydrogen</a> for having 2 more
 <a href="https://en.wikipedia.org/wiki/Isotope">isotopes</a>.</li>
 </ul>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge</h3>
+<p><strong>If you want a greater challenge, don’t read any further</strong>:
+just try to understand the program via the source.</p>
+<p>If you get stuck, come back and read below for additional hints and information.</p>
+<h3 id="secret-switch">Secret switch</h3>
+<p>See [secret.html[(secret.html) for a bit if secret switch information.</p>
 <!--
 
     Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.

1995/vanschnitz/README.md

@@ -33,6 +33,14 @@ For more detailed information see [1995/vanschnitz in bugs.html](../../bugs.html
 ```
 
 
+### NOTICE to those who wish for a greater challenge
+
+**If you want a greater challenge, don't read any further**:
+just try to understand the program without looking at the Alternate code.
+
+If you get stuck, come back and look at the Alternate code.
+
+
 ## Alternate code:
 
 The authors provided a deobfuscated version of the program. Originally uuencoded we

1995/vanschnitz/index.html

@@ -418,6 +418,10 @@ in 2023. See <a href="#alternate-code">Alternate code</a> below.</p>
 <pre><code>    ./vanschnitz</code></pre>
 <h2 id="try">Try:</h2>
 <pre><code>    ./try.sh</code></pre>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge</h3>
+<p><strong>If you want a greater challenge, don’t read any further</strong>:
+just try to understand the program without looking at the Alternate code.</p>
+<p>If you get stuck, come back and look at the Alternate code.</p>
 <h2 id="alternate-code">Alternate code:</h2>
 <p>The authors provided a deobfuscated version of the program. Originally uuencoded we
 have decoded it for the wider audience in <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1995/vanschnitz/vanschnitz.alt.c">vanschnitz.alt.c</a>.</p>