Health for Enemies

[Pixzel]

So for each enemy, they have a health var of 50 when you start the game. How do I make it so that every four minutes, their health will go up. So say like:

4:00 min in the game > set +60 to health var

But when I do that, it will always be set enemy health to 60 HP so you won't be able to kill them because it will always set to 60.

[dcrew]

-Every 00:04:00
--Add '60' to 'Enemy.AlterableValue.HP'

If you need an example, Ask and I'll be happy to make one.

[Warmachine]

Is this a counter (number) or an actual health bar? reason i ask is, if it is a visual one (i.e with colors to represent + and - HP) then it could be fixed with an active object...