Word Scores

Blocks of letters are falling down. Can you form words fast enough to keep the board from filling up and beat your high score?
Valid Words
Words must be 4 letters minimum.
Words can be up to 15 letters maximum.
Words can be spelled vertically or horizontally.
There are about 70,000 valid words, including many proper nouns and names.
Game-play
At the start of every game, the first four blocks to spawn are always "W", "O", "R", "D".
The board starts at only 4 columns wide, when you form a word that spans all columns, the board grows 1 column wider.
As the board grows wider, there are more chances for 2 or 3 blocks to spawn instead of a single block.
Scoring
Less common letters are worth more points.
Words longer than 4 characters award a bonus that grows with word size.
Cascades award a bonus. (When another word is formed after blocks get cleared and fall down)
Words that span all columns of the board award a bonus that grows with board size.
A single letter forming a valid word both vertically and horizontally awards a bonus based on the letter's rarity.
Bonus Blocks
Wildcard

Upon landing, wildcard tries every letter, from highest point value to lowest, to see if a valid word can be formed. If no letter can make a valid word, a letter is chosen at random.

Clear Column

Clears all blocks in the column landed in, giving points for all letters cleared.

Clear Row

Clears all blocks in the row landed in, giving points for all letters cleared.

Clear Spaces

Clears all space blocks on the board.

Clear Grid

Clears all blocks on the board, giving points for all letters cleared.