Viking puzzle

Hear ye, hear ye! The Vikings have landed and they are furious! Multicolored bricks block access to their boats. The only way through is to break them, but the more they hit them with their clubs, the more bricks appear. It's up to you to combine the colors. But be careful: you have limited time to do so! An arc of electricity is coming towards you. If it touches you before your Vikings regain control of their ship, the game is over.