Modify maps a bit

media/manual.txt

@@ -238,6 +238,12 @@ A few tips for making maps:
   basically has to check every triangle against every other triangle, i.e. the
   time needed to load the map slows down quadratically with the number of
   triangles.
+- Triangles can be saved by cleverly using simpler types of blocks where
+  possible, for example walls can be made with rotated ramps rather than full
+  blocks, which for a long wall may reduce triangle count considerably while
+  not even being noticed by the player.
+- There is a special "mirror" block that's very useful for creating
+  8-symmetrical structures.
 
 ~~~ COMPILING AND MODIFYING ~~~
 
@@ -245,8 +251,8 @@ TODO
 
 ~~~ FAQ ~~~
 
-Q: This game is free? Do I have to pay for it? What can I legally do with it?
-Can I use it commercially? What's the catch?
+Q: Is this game really free? Do I have to pay for it? What can I legally do with
+it? Can I use it commercially? What's the catch?
 
 A: This game is public domain, free as in freedom and free as in beer, i.e. it
 is free software (some would say "open source", which is however a very bad
@@ -262,6 +268,12 @@ be "enforced" legally, and neither are you pressured to it morally. There is no
 catch to this, the project wasn't made as a capitalist product, it's something
 that's meant to help the people.
 
+Q: Can I still voluntarily donate money?
+
+A: Currently it is possible, donation info is on my website (www.tastyfish.cz),
+but I am not dependant on donations and don't even encourage them too much, but
+if you still insist, I'll be very grateful, thank you very much.
+
 Q: Why is the physics so buggy?
 
 A: You are right in the observation that Licar physics is not perfect. This is