initial
added app.rb
drawing window
removed Robot class, added stub for update
added images from multiply
drawing random colored ufo at start
problem travels with ufo
set window width, height and drawing background
formatting
added key detection from chingu examples
attributed key detection from examples
ufo moves down again
converting typed number into integer
no more key repeats
cleanup and final answer is created from array
using bundler and rbenv
ufo and problem destroyed when correct answer typed and return pressed
reading problems and answers from file
problems being put in problem_hash
loading poblems file when initializing window