Damage-boosting through the final door skips collecting all 8 keys normally needed to win. It's incredibly easy to pull off, yet it was the cause of much frustration. It's very hard to get through the door in only two shots. You need some luck (or maybe I just don't know the proper positioning to manipulate the enemy).

Compared to the TAS, I get an extra "rock increase" in world 1 and an extra "rock increase" and "power increase" in world 2. This gives me the ability to kill the final robots in 2 rocks rather than 3, and also gives me enough rocks that I won't have to punch at all. Makes the final boss a breeze.

Improvements? I should've just jumped over the enemy at the start of the 7th world, and I'm not sure if the last speed potion really makes a difference. Double jumping could be perfected as well - normally, you can't jump from certain surfaces, but it's possible if you jump just as you land from another jump.

This run was played using a Gyromite converter on an American NES.

When I first played this, it was annoying not to have any way to save your progress. But once you're familiar with it, it's easy to beat it quickly. (strategywiki.org has excellent maps and a guide).

The invulnerability you get on every single screen upon entering really helps out. The fact that items/doors aren't revealed until you move out of the way doesn't. Also, there's the nice way the game restores your HP after beating each boss.

Yes, the in-game timer is way off.

This run was played using a Gyromite converter on an American NES.