PrinceWatercress plays Mega Man 4 - Part 5 of 8

Here we go...Dr. Cossack's Castle! Time to get down to business and see why he's suddenly challenging us!

Dr. Cossack 1

The slinky robot slowly moves towards you. It acts like a slinky when it drops off an edge.

The thick snow slows you down tremendously, so jump through it to get through the level faster.

When you make it to the rooftop, you'll be dealing with the Skull Joes from Skull Man's stage as well as the little robots that come out of the pits from Dust Man's stage, and to top it off you'll also be dealing with ice floor physics.

The second vertical climb will require Rush Coil, and you'll have to time your climbs on the ladder near the end so that the crushing robots that roam up and down the ladders near the end don't close on you.

The boss in the first section is some giant moth robot thing. The fireballs fire right to where you are when the fireball is launched, so it has a tracking ability that can easily be exploited. You can stay all the way to the left and fire at the flashing light where the fireballs come from with either the Ring Boomerang or charged Mega Buster shots, but just be careful with those fireballs and jump later than usual when the boss is right next to you. Also, the boss can destroy the floor with its tail. Be careful.

If you die against this boss, you'll start back at the rooftop section before the second vertical climb complete with all those ladders. That's horse shit.

Dr. Cossack 2

This time around, you'll be inside a building, so don't worry about any ice physics.

Use the Rush Jet to get over the pit, and use Up and Down on the Control Pad to get higher and lower whenever necessary. The Rush Jet automatically flies forward this time around compared to the near-total freedom of movement 

The small square platforms have spikes that change from being horizontal to being vertical and back again every few seconds. Use Rush Jet for the first set. You'll have to be patient with the second set...unless you have the Balloon. If you do, you can use that to slip past all the blocks.

The boss here is a miniature room in a room that has three segments. The top and bottom go to the right while the middle goes to the left. Slide under the bottom segment as it passes. It makes three passes at you, and each successful pass is slower than the last. When it goes slow enough for you to get in (read: when it passes around a third time), slide into the miniature room as it comes together, then get on one of the two platforms and hit the red circle at the top with Dust Crusher and try not to get shot at yourself. Switching between platforms isn't as efficient as staying on one, but the laser from the red circle will miss every single time. The circle fires three lasers before the miniature room comes apart again. When the miniature room comes apart, get out of there. From there, wait until it's slowed down considerably and try your luck at damaging the miniature room again.