I spend weeks after weeks missing even up to 80% chances. At up to day 260, and still hovering dangerously around 2.5K, I think I've had enough of this game. Not to mention the terribly long wait which is 7 times the amount of time you actually play.
You don't need the gold nail, contrary to what Fallen says. Everytime I bought the gold nail, I always fell short by 250-500 gold. Airships simply require 4 hits which can be done pretty easily. Furthermore, they move slow. Thus, by not getting the gold nail, you are pretty much guaranteed the hard badge.
I have 30 hp, the enemy has 4. I use a 92% attack 5 times in a row and miss. The enemy keeps firing bolts of 5-19 damage, thus I lose before I can kill him. Anyone calculate the probability of missing 5 92% attacks in a row?
Use the magical, mystical Space key which automagically clears the path underneath the cursor.