Today I tried a new game. When I got close to 30 minutes of playing time, I decided to go ahead and get World 4 Level 3 and then quit. Fifteen minutes later, I was starting to HATE World 4 Level 3. The next two levels seemed a lot easier. World 4 Level 5 is the end of the game.
Thanks, Bernie.
The second time I went there, it only took 11:15:72 for the whole thing. It makes me wonder how I took a half hour getting to World 4 Level 3.