Cubes - Hit Point(s)

Cubes may be more or less resistant.

• Cube may have [0 to 3] hit points
• When Hit Points is equal to 0, the cube is removed

Example: Resistant Rock

• default behavior: remove 1 hit point

Example: mixing "face trigger", "Neighbors" & "hit points"

• default behavior: nothing happen
• face trigger behavior: 
• remove the face trigger behavior
• remove 1 hit point to the cube and its similar neighbours