Blip used for the last 10 seconds
Updated background image
Updated with Rubocop advice.
Added comments
Added a font and a sound
Updated constants for less tiles in the same area.
Inserts fewer words because of fewer tiles.
The game idea has solidified.

The game has now become fnding the words explicitly inserted and
any other words in the wtwords list.
There is a countdown noise for the last 10 seconds of 4 minutes.