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The dash is normally a forced upgrade (you can't pass through Chill Penguin's stage without getting it). This password gets you to Sigma's fortress with nothing but the Maverick's weapons. There are many other passwords that can achieve this effect, and they really only need to bypass Chill Penguin's stage without giving you the dash.
These are the final fights with Sigma in Mega Man X, with only X Buster use, and the only upgrade being the forced arm upgrade given to you earlier in Sigma's fortress. Fighting the Sigma battles without the dash and Maverick weapons can seem like a nightmare, but it isn't anywhere near impossible. Give it a try.
Here are some tips for pulling this off:
-Sigma's dog, Velguader, is knocked out of an attack by a second level charged shot (the blue one) or higher (the purple one). Since they both do the same amount of damage, second level charged shots are the best way to attack it with the X Buster.
-Optimally, you should keep about two body lengths (X's body) between X and Velguader. This allows you to easily run under its jumps and energy balls, and gives you enough time to react when it runs at you or breathes flames.
-Sigma is hurt for one notch from any attack other than Electric Spark, so there shouldn't be any need to charge the X Buster. However, you may wish to anyway because the charged shots have properties that increase chances of hitting Sigma when he's jumping off the walls: The first-level green shot is slower, and both cover more area.
I fought Sigma's final form the normal way for the first half of his health to demonstrate how to dodge his attacks, then switched to the cheap method (sitting on his hands) for the other half. This one turned out pretty sloppy, but overall, I feel it gets the points across that I wanted it to. If you look closely, you can tell when my nose was itchy!
Tags: Mega Man Megaman Sigma Dash Buster
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