Canister #1: There are three display cases you need to wreck for this one.
The first is in the near right portion of the main gallery. Make a fan
from another display case (which doesn't count) and ride it up to the
proper one. The second display case is in the next area (with the gas) and
is on the lower floor. The last is in the same area, on the upper floor in
back left corner (near a pushable pillar).
Hostage (Heat Protection): In the first area, go to the right before leaving
via the "?" mark panel door. Double jump to the ledge and explode the shiny
door. Pass through the steam.
Power Brick (Heat Protection): In the same area as the hostage, push each
block into the same area as the picture of the fruit with the same color, so
the red block goes next to the cherry, etc. You might have to push certain
blocks out of the way first.
Once you start up the hallway after opening the ? mark window,
shoot the fuse box near the beams with a long-range weapon to open the
way to this.