update readme a little

README.md

@@ -8,6 +8,14 @@ in HTML5, JavaScript, and SVG.
 
 The game is fully client-side and static, you can simply download it and open locally as well.
 
+Tips
+----
+
+- **"Pretty graphics" are disabled by default** to give new users a smoother experience.
+Tap the Effects button to see if you like it and it doesn't lag the browser too much.
+Settings are saved in the browser.
+- **You can copy the URL to share a particular board setup**
+
 Game rules
 ----------
 
@@ -25,12 +33,18 @@ around it.
 
 **Reaction rules:**
 
-- Vitae reacts only with Mors
+- Vitae reacts only with mors
 - Elements react with the same element kind, or with Salt
-- Salt reacts with Elements or with itself
-- Metals react with Mercury, but they unlock one by one, from the most common Lead to Gold.
+- Salt reacts with elements or with itself
+- Metals react with mercury, but they unlock one by one, from the most common lead to gold (see below)
 - Gold is removed by itself as the last metal
 
+Salt works as a wildcard of sorts, but don't be fooled - some boards *require* you to use it
+as a wildcard, some can be solved with salt matched only to salt, some might even require you to do so.
+When you match salt with an element, you naturally must use another salt with the same element elsewhere,
+they're all placed in pairs. Using salt as a wildcard (or alone choosing one of several available pairings)
+requires some forethought or luck.
+
 **The metals sequence is as follows:**
 
 1. Lead + Mercury
@@ -54,10 +68,12 @@ The user interface contains a few buttons and toggles:
 - *Undo* - reverts one game action (reaction of two marbles). There is no limit on how many
   steps you can undo.
 
-The bottom left corner contains settings:
+The bottom left corner contains minor buttons and settings:
 
-- *Effects* - enable graphic effects that look pretty but perform poorly on mobile phones or
- browsers without hardware acceleration.
+- *Help* - links you to this page with the README file
+- *Fullscreen* - toggles fullscreen. This is useful on a phone to hide the annoying address bar.
+- *Effects* - enable graphic effects that look pretty but perform poorly on phones or
+  browsers without hardware acceleration. Glow is replaced with a solid circle, for example.
 - *Dim Blocked* - highlight marbles that can be played by dimming the others. This makes the game 
   much harder, but is more realistic.
 - *Sloppy Gen* - allow sloppy board filling. Use if building the board takes too long on