Ok lol, I found a bug to the script.
Every time a lever gets pulled to the right position, it adds 1 to the LocalVarInt "Levers", so, you could just pull a lever 6 times, and you would have solved the puzzle, I have a video showing you if you do not undeerstand. Can anyone tell me how to fix this?
http://www.youtube.com/watch?v=L2cz1IP1D...e=youtu.be 
Here is the script again, since I have changed a few things:
/////////////////////
//BEGIN LEVER SCRIPT
/////////////////////
void PullLever1(string &in asEntity, int alState) 
{
	if(alState == 1){
 
 AddDebugMessage("Lever 1 is in the right position", false);
 AddLocalVarInt("Levers", 1);
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}else if(alState == 0){
 
 AddDebugMessage("Lever 1 is in the wrong position", false);
	}else if(alState == -1){
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}	
	
	if(GetLocalVarInt("Levers") == 6){
	
 AddDebugMessage("SUCCES", false);
 
 PlayMusic("13_puzzle_machine.ogg", false, 1.0f, 0, 1, false);
 SetMessage("Messages", "Succes", 5);
 SetPlayerSanity(90);
 AddPlayerSanity(10);
 
 //
 SetGlobalVarInt("SixLeversComplete", 1);
 //
 
 SetLeverStuckState("lever_machine_lever01", 1, false);
 SetLeverStuckState("lever_machine_lever02", -1, false);
 SetLeverStuckState("lever_machine_lever03", -1, false);
 SetLeverStuckState("lever_machine_lever04", 1, false);
 SetLeverStuckState("lever_machine_lever05", 1, false);
 SetLeverStuckState("lever_machine_lever06", -1, false);
 
 AddTimer("", 5, "TouchLeversAfterCompletion");
 
	}else{
 
 AddDebugMessage("The levers aren't in the right positions", false);
 
	}
}
void PullLever2(string &in asEntity, int alState)
{
	if(alState == -1){
 
 AddDebugMessage("Lever 2 is in the right position", false);
 AddLocalVarInt("Levers", 1);
	}else if(alState == 0){
 
 AddDebugMessage("Lever 2 is in the wrong position", false);
 
	}else if(alState == 1){
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}
	
	if(GetLocalVarInt("Levers") == 6){
	
 AddDebugMessage("SUCCES", false);
 
 PlayMusic("13_puzzle_machine.ogg", false, 1.0f, 0, 1, false);
 SetMessage("Messages", "Succes", 5);
 SetPlayerSanity(90);
 AddPlayerSanity(10);
 
 //
 SetGlobalVarInt("SixLeversComplete", 1);
 //
 
 SetLeverStuckState("lever_machine_lever01", 1, false);
 SetLeverStuckState("lever_machine_lever02", -1, false);
 SetLeverStuckState("lever_machine_lever03", -1, false);
 SetLeverStuckState("lever_machine_lever04", 1, false);
 SetLeverStuckState("lever_machine_lever05", 1, false);
 SetLeverStuckState("lever_machine_lever06", -1, false);
 
 AddTimer("", 5, "TouchLeversAfterCompletion");
 
	}else{
 
 AddDebugMessage("The levers aren't in the right positions", false);
 
	}
}
void PullLever3(string &in asEntity, int alState)
{
	if(alState == -1){
 
 AddDebugMessage("Lever 3 is in the right position", false);
 AddLocalVarInt("Levers", 1);
	}else if(alState == 0){
 
 AddDebugMessage("Lever 3 is in the wrong position", false);
 
	}else if(alState == 1){
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}
	
	if(GetLocalVarInt("Levers") == 6){
	
 AddDebugMessage("SUCCES", false);
 
 PlayMusic("13_puzzle_machine.ogg", false, 1.0f, 0, 1, false);
 SetMessage("Messages", "Succes", 5);
 SetPlayerSanity(90);
 AddPlayerSanity(10);
 
 //
 SetGlobalVarInt("SixLeversComplete", 1);
 //
 
 SetLeverStuckState("lever_machine_lever01", 1, false);
 SetLeverStuckState("lever_machine_lever02", -1, false);
 SetLeverStuckState("lever_machine_lever03", -1, false);
 SetLeverStuckState("lever_machine_lever04", 1, false);
 SetLeverStuckState("lever_machine_lever05", 1, false);
 SetLeverStuckState("lever_machine_lever06", -1, false);
 
 AddTimer("", 5, "TouchLeversAfterCompletion");
 
	}else{
 
 AddDebugMessage("The levers aren't in the right positions", false);
 
	}
}
void PullLever4(string &in asEntity, int alState)
{
	if(alState == 1){
 
 AddDebugMessage("Lever 4 is in the right position", false);
 AddLocalVarInt("Levers", 1);
 
	}else if(alState == 0){
 
 AddDebugMessage("Lever 4 is in the wrong position", false);
 
	}else if(alState == -1){
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}
	
	if(GetLocalVarInt("Levers") == 6){
	
 AddDebugMessage("SUCCES", false);
 
 PlayMusic("13_puzzle_machine.ogg", false, 1.0f, 0, 1, false);
 SetMessage("Messages", "Succes", 5);
 SetPlayerSanity(90);
 AddPlayerSanity(10);
 
 //
 SetGlobalVarInt("SixLeversComplete", 1);
 //
 
 SetLeverStuckState("lever_machine_lever01", 1, false);
 SetLeverStuckState("lever_machine_lever02", -1, false);
 SetLeverStuckState("lever_machine_lever03", -1, false);
 SetLeverStuckState("lever_machine_lever04", 1, false);
 SetLeverStuckState("lever_machine_lever05", 1, false);
 SetLeverStuckState("lever_machine_lever06", -1, false);
 
 AddTimer("", 5, "TouchLeversAfterCompletion");
 
	}else{
 
 AddDebugMessage("The levers aren't in the right positions", false);
 
	}
}
void PullLever5(string &in asEntity, int alState)
{
	if(alState == 1){
 
 AddDebugMessage("Lever 5 is in the right position", false);
 AddLocalVarInt("Levers", 1);
 
	}else if(alState == 0){
 
 AddDebugMessage("Lever 5 is in the wrong position", false);
 
	}else if(alState == -1){
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}
	
	if(GetLocalVarInt("Levers") == 6){
	
 AddDebugMessage("SUCCES", false);
 
 PlayMusic("13_puzzle_machine.ogg", false, 1.0f, 0, 1, false);
 SetMessage("Messages", "Succes", 5);
 SetPlayerSanity(90);
 AddPlayerSanity(10);
 
 //
 SetGlobalVarInt("SixLeversComplete", 1);
 //
 
 SetLeverStuckState("lever_machine_lever01", 1, false);
 SetLeverStuckState("lever_machine_lever02", -1, false);
 SetLeverStuckState("lever_machine_lever03", -1, false);
 SetLeverStuckState("lever_machine_lever04", 1, false);
 SetLeverStuckState("lever_machine_lever05", 1, false);
 SetLeverStuckState("lever_machine_lever06", -1, false);
 
 AddTimer("", 5, "TouchLeversAfterCompletion");
 
	}else{
 
 AddDebugMessage("The levers aren't in the right positions", false);
 
	}
}
void PullLever6(string &in asEntity, int alState)
{
	if(alState == -1){
 
 AddDebugMessage("Lever 6 is in the right position", false);
 AddLocalVarInt("Levers", 1);
 
 
	}else if(alState == 0){
 
 AddDebugMessage("Lever 6 is in the wrong position", false);
 
	}else if(alState == 1){
 PlaySoundAtEntity("", "lever_mech_min_max", asEntity, 0.0f, false);
	}
	
	if(GetLocalVarInt("Levers") == 6){
	
 AddDebugMessage("SUCCES", false);
 
 PlayMusic("13_puzzle_machine.ogg", false, 1.0f, 0, 1, false);
 SetMessage("Messages", "Succes", 5);
 SetPlayerSanity(90);
 AddPlayerSanity(10);
 
 //
 SetGlobalVarInt("SixLeversComplete", 1);
 //
 
 SetLeverStuckState("lever_machine_lever01", 1, false);
 SetLeverStuckState("lever_machine_lever02", -1, false);
 SetLeverStuckState("lever_machine_lever03", -1, false);
 SetLeverStuckState("lever_machine_lever04", 1, false);
 SetLeverStuckState("lever_machine_lever05", 1, false);
 SetLeverStuckState("lever_machine_lever06", -1, false);
 
 AddTimer("", 5, "TouchLeversAfterCompletion");
 
	}else{
 
 AddDebugMessage("The levers aren't in the right positions", false);
 
	}
}
void TouchLeversAfterCompletion(string &in Timer)
{
	SetEntityPlayerInteractCallback("lever_machine_lever01", "TouchSixLeversStuck", false);
 SetEntityPlayerInteractCallback("lever_machine_lever02", "TouchSixLeversStuck", false);
 SetEntityPlayerInteractCallback("lever_machine_lever03", "TouchSixLeversStuck", false);
 SetEntityPlayerInteractCallback("lever_machine_lever04", "TouchSixLeversStuck", false);
 SetEntityPlayerInteractCallback("lever_machine_lever05", "TouchSixLeversStuck", false);
 SetEntityPlayerInteractCallback("lever_machine_lever06", "TouchSixLeversStuck", false);
}
void TouchSixLeversStuck(string &in asEntity)
{
	SetMessage("Messages", "TouchSixLeversStuck", 5);
}
//////////////////
//END LEVER SCRIPT
//////////////////
void OnStart()
{
	//BEGIN LEVER SCRIPT 
 SetEntityConnectionStateChangeCallback("lever_machine_lever01", "PullLever1");
	SetEntityConnectionStateChangeCallback("lever_machine_lever02", "PullLever2");
	SetEntityConnectionStateChangeCallback("lever_machine_lever03", "PullLever3");
	SetEntityConnectionStateChangeCallback("lever_machine_lever04", "PullLever4");
	SetEntityConnectionStateChangeCallback("lever_machine_lever05", "PullLever5");
	SetEntityConnectionStateChangeCallback("lever_machine_lever06", "PullLever6");
	
	SetLocalVarInt("Levers", 0); 
 //END LEVER SCRIPT
}