World 1 - Level 3
Upon Further Reflection

Push the (yellow) reflector up to eliminate the two Coileys. Then push the two reflectors one step along the green paths to clear the access to the second half of the level.

To collect the Rainbow coins, simply push the two (blue) reflectors in front of the cannons. To collect the bonus points, use one of the boxes to build a bridge at the red "x", then push one reflector each along the red and purple path.