Castle of Elite - Official game guide|
Introduction - Basics - Solutions - Secrets - Trivia
When the guide tells you to place a brick symbol on a certain square, it means you should aim the mouse cursor on that square.
Secret 2: Mountain climber
A: Destroy these bricks. Wait for the Trundlers to gather at the bottom.
B: Destroy this brick when the time is right, then quickly destroy C. Climb the mountain and get the coins.