How do you get the red power brick to unlock the blue key for Lego Batman DS The Video Game?

Answer 1

With no spoilers here is the locations, all hero levels are Suit Upgrades and all Villain levels are Extras!

Hero

1.1-Fast Grapple (all suits)

1.2-Fast Batarangs (all suits)

1.3-More Batarang Targets (all suits)

1.4-Flaming Batarang (Heat Protection Suit)

1.5-Slam (glide suit)

2.1-More Detonators (demolition Suit)

2.2-Armour Plating (demolition suit)

2.3-Sonic Pain (sonic suit)

2.4-Area Effect (sonic suit)

2.5-Bats (sonic suit)

3.1-Freeze Batarang (water suit)

3.2-Decoy (technology Suit)

3.3-Fast Walk (magnet suit)

3.4-Faster Pieces (attract Suit)

3.5-Piece Detector (attract suit)

Villain

1.1 -x2 score

1.2 -x4 score

1.3-x6 score

1.4-x8 score

1.5-x10 score

2.1-Stud Magnet

2.2-Character Studs

2.3-Minikit Detector

2.4-Power Brick Detector

2.5- Always Score Multiply

3.1-Fast Build

3.2-Immune to Freeze

3.3- Regenerate Hearts

3.4-Extra Hearts

3.5- Invincibility

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Answer 2

in the batwing chase, third part of jokers last laugh - fly over red switches to get it.

Answer 3

fight the man and go threw doors