A new gameplay trailer for Nintendo 3DS RPG Mario & Luigi: Dream Team shows how changing the "real world" of the game effects Luigi's dream reality.
In one example, using the 3DS stylus to tickle Luigi's nose makes him sneeze, pushing blocks from the background into the foreground. In another, the player uses the stylus to bump Luigi's hand against an air conditioning unit, turning the dream world to ice and freezing a geyser.
The Mario Bros also have gameplay tricks of their own not involving manipulating poor Luigi's dreams; Luigi can spawn dozens of copies of himself that Mario can roll around like a katamari or use as a bowling ball.
Mario & Luigi: Dream Team hits 3DS this August. Check out our E3 preview of the game for a deeper look.