Build a bridge to the portal from blocks scattered around the level. Watch out for your opponent, don't let him catch you or destroy the blocks you've placed. Save your allies, they will help you build the bridge.
To pass the level: build a bridge from the scattered blocks and pass through it into the portal. Controls on PC: Use the W\A\S\D keys to control the character. Controlling on a mobile device: Tap the screen and use the joystick to control the character.