World 6 - Level 6
A little Detour
Use Stinky to re-arrange the box and two reflectors by using the box to build a bridge at the yellow "X", and pushing the two reflectors into opposite corners. Switch to Loof, and collect the nearby Rainbow Coin... this will allow the fireball to travel along the light blue path and destroy the Chompers at or near the blue "X".
Now move reflectors to guide the fireballs along the white path. Reflectors to be moved are shown in black, and final positions in white. This path will destroy the wooden box under the cannon and allow access to the final Rainbow coin.