I recently downloaded Mega Man 10 off the Wii Shopping Channel and decided this time around that I was going to try to finish a Mega Man game without using any energy tanks or special weapons. It's funny, because up until this point in my Mega Man playing career I never realized how much strategy is required to defeat the bosses when you cannot spam them to death with the weapon they are weak against.

I'm currently stuck on Wily's Fortress Level 4, as I cannot defeat the eight robot masters back to back (I don't have any good method of defeating either Solar or Nitro Man). I tried the same approach to Mega Man X2 and I have yet to defeat Wolverine Sigma.

Anyhow, have you ever taken this approach to a Mega Man game, and if so, which robot masters, bosses and games as a whole did you find to be the most challenging?