Game: Alphabet Rain

• Game board design

  layout, logo, branding, message displaying, counting, etc.

• The rain dorp strategy...

  Border caculation
  When to show up?
  How fast it drop?
  When to disapear?

• The counting strategy...

  what to count? total letter? failed letter?
  

• The level up strategy...

  when to level up?
  what to reward for level up?

• The game over strategy...

  when to game over?
  

• Dependences: d3, d3-cloud, jQuery
  Bootstrap is optional.
• Math.random will return range between 0 and 1. It will include 0 but NOT include 1.
• Q: what is the effecient way to control the size of the word cloud?

About text

• text could have all CSS style attributes, including font-family, font-size, etc.
• The generic family name monospace has the same fixed width for all glyphs. Here is a example font family: "Lucida Console", Courier, monospace
• SVG Element text from MDN is very good!