This is actually very easy with a flying character with a laser ability.
(unlocked for fully completing Undermined - costs 250,000) OR a Custom Character
created in Edna's House with the light super power as your first character and select Elastigirl
as your second character.
Load up: Elastigirl On The Case - Free Play - Screenslaver Chase
- Simply fly over everything in the first corridor section
- Use Elastigirl to pull down the stairs
- Use Fironic/Custom to fly up and push the buildable down and then assemble the cannon
- Use Elastigirl on the pad
- Use Fironic/Custom to laser the gold fuse and then fly up and out the door
- Simply fly over everything in the second corridor section
- Use Elastigirl to pull the handle
- Use Fironic/Custom to laser the gold wall and then fly up and down the corridor for the last time