Various Gameplay Tips
Tip 1: Defend, defend, and defend. When you see an icon flashing at the bottom of the screen, stop what you're doing, tap to face that enemy and block the imminent threat.
Tip 2: Weakspots can be difficult to find and sometimes it's a case of experimentation. Sometimes your patience is also rewarded.
Tip 3: Loose bricks can sometimes be a tiny flash on a wall. If you're in a room with a ? in it, look everywhere, and look closely.