Making a lever puzzles...

[FlawlessHappiness]

You need to use variables.

Variables work like this. You automaticly create one by writing:
AddLocalVarInt("LeverPuzzle", 1).

Now the variable is called "LeverPuzzle", and has the number 1.

Now what you want is that each lever makes the variable go up.
Each lever must call a callback called "LeverCallback". YOu write this in the ConnectionState in the entity's properties in the level editor..

Here is the script for the levers.

void LeverPuzzle(string &in asEntity, int alState)
{
if(alState == 1) //If the levers are pulled a specific way.
{
AddLocalVarInt("LeverPuzzle", 1)

}

if(GetLocalVarInt("LeverPuzzle") == 4) //If the variable is 4, which means all levers are pulled.
{
SetEntityActive("WaterEntity", false);
}
}

This is the simple version.