You Can Play online unblocked Merge Blast Game enjoy it
In the game Merge Blast you have to protect your castle from stones falling on it. A cannon will be installed in the middle of the castle roof, which you can control with the mouse and the control keys. You need to aim the cannon at a boulder and, having scoped it, open fire. A projectile hitting a rock will explode and destroy the block. Once this happens, you get points in the Merge Blast game and proceed to destroy the next target.