1. the Game of Life
  2. squares(), klear(), draw()
  3. seed()
  4. neighbours(r,c), rc2id(r,c)
  5. the next generation rules
  6. gen()
  7. square clicking
  8. the glider, one_step()
  9. button layout
  10. adding more buttons
  11. implementing run, Improving the layout
  12. the glider
  13. the glider gun