So far all the help that I have received here has worked in my game and I really appreciate, I would like to ask another question, I am building a pyramid level, this level is filled with traps, like fire and falling walls, I would like to build a box that shoots spears and keeps repeating by creating another spear after a couple of seconds, also I would like that the spears that the box creates disappear after a couple of seconds how would make a code for this ?

Look up ent_create and ent_remove in the manual. As far as the design of your level goes, what I normally do is just take out GIMP and start formulating a plan from a top-down type of view.

Here's some untested pseudo code

Code:

---

function hitEvent()
{
   if(event_type == event_entity)
   {
      if(you == player)
      {
          player.health -= 50; //reduce player health
      }
      ent_remove(me);
   }
   if(event_type == event_block)
   {
      ent_remove(me);
   }
   return;
}

action arrowFly
{
    var arrowCounter
    my.enable_block = on;
    my.enable_entity = on;
    my.event = hitEvent;
    my.passable = on;
    while(arrowCounter < 100)  //play with this (arrow's flight time)
    {
       my.skill20 = 10; //play with this (arrow's speed)
       my.skill21 = 0;
       my.skill22 = 0;
       move_mode = ignore_passable;
       ent_move(my.skill20,nullvector);  //or use c_move
       if(vec_dist(my.x,you.x) < 50)
       {
            my.passable = off;
       }
       wait(1);
    }
    ent_remove(me);
}
action arrowBox
{
   var counter;
   while(1)  //play with this number (amt of time between firing an arrow
   {
       if(counter == 50)
       {
           you = ent_create(arrowMDL,my.x,arrowFly);
       }
       counter += 1;
       if(counter < 50)
       {
           counter = 0;
       }
       wait();
}
       
  

---

arrowBox creates an arrow everytime the counter gets to fifty. When the counter is greater than fifty, the counter resets. The arrow flies straight out along x-axis until its counter reaches 100 ticks, its flight time. At 100, the while loop is broken so the arrow removes itself. If the arrow hits an object named player, health is reduced and the arrow is removed. If the arrow hits a block, it is removed.

I know you said it was pseudocode, but to shed some more light on it, I altered some things.

Problems. Revised Code:
Code:

---

function hitEvent()
{
   if(event_type == event_entity)
   {
      if(you == player)
      {
          player.health -= 50; //reduce player health
      }
      ent_remove(me);
   }
   if(event_type == event_block)
   {
      ent_remove(me);
   }
   return;
}

action arrowFly
{
    var arrowCounter=0;
    my.enable_block = on;
    my.enable_entity = on;
    my.event = hitEvent;
    my.passable = on;
    while(arrowCounter < 100)  //play with this (arrow's flight time)
    {
       my.skill20 = 10; //play with this (arrow's speed)
       my.skill21 = 0;
       my.skill22 = 0;
       move_mode = ignore_passable;
       ent_move(my.skill20,nullvector);  //or use c_move
       if(vec_dist(my.x,you.x) < 50)
       {
            my.passable = off;
       }
       wait(1);
       arrowCounter += 1;   //arrowCounter must increment to prevent dead loop
    }
    ent_remove(me);
}

action arrowBox
{
   var counter=0; // counter has initial value of zero
   while(1) // continue firing indefinitly
   {
       if(counter == 50) //play with this number(amt of time b/t firing an arrow
       {
           you = ent_create(arrowMDL,my.x,arrowFly); //create new arrow
       }
       counter += 1;
       if(counter >= 50) // if counter is GREATER than 50 (or equal), reset
       {
           counter = 0;
       }
       wait(1);
   }
}

---

oops! my bad. i hate those <> signs. can never til which until i test . . .

I know this is of no importance at all, but you could get rid of one of these if statements as far as I know:
Code:

---

action arrowBox
{
   var counter=0; // counter has initial value of zero
   while(1) // continue firing indefinitly
   {
       if(counter == 50) //play with this number(amt of time b/t firing an arrow
       {
           you = ent_create(arrowMDL,my.x,arrowFly); //create new arrow
       }
       counter += 1;
       counter %= 50;
       wait(1);
   }
}

---

I didn't even think about the mod operator. Although you would have to use counter%51. counter%50 would change the value of counter to zero once is hits 50 so the if statement would never evaluate to true.
For those of you who have no clue what the % ("mod") symbol is, I will explain. This may not be the best or clearest explanation but I will try. If anyone wants to reply with clarification, please feel free too.
Now then:
The modulus operator %(percent sign).
Mod will actually subtract the multiples of a number from another number. For example, if you were to do 150 % 50, you would get a result of zero. Reason is because 150 has 3 multiples of 50 in it. So 150-(3*50) = 0. If it were 153%50 instead, the answer would be 3 since 153-(3*50)=3. For extra clarification, let's do one more. 23 % 7. Well if you continue to take multiples of 7 without going over 23, you find that the closest you can get is 21 (i.e. 3 multiples of 7). So 23 - (3*7) = 2.
Now what this number actually represents is the integer remainder of division. So 23/7 would be 3 2/7. So the remainder 2/7 is taken and the numerator is your Mod result.
In the case with the arrows(in the code above), what this does is keep the value of the variable counter to a number in the range of 0 to 50. Once it reaches a value of 50, the if statement is true, code is executed in the corresponding statement block and counter gets reset to 0.
All this should probably go in the coding section but I figured since it was brought up, I would shed some light on it for those who didn't know. I try to be as helpful as I can since I know I have received a lot of help from other people on here.

@Prog_Plus_plus:
Yeah you're right about the 50, however changing the order of the instructions does help too
Oh and good explanation about the % Operator.

@topic:
here is an update, tested version:
Code:

---

action arrowBox
{
   var counter=0; // counter has initial value of zero
   while(1) // continue firing indefinitly
   {
   	counter += 1;
       if(counter == 50) //play with this number(amt of time b/t firing an arrow
       {
           you = ent_create(arrowMDL,my.x,arrowFly); //create new arrow
       }
       counter %= 50;
       wait(1);
   }
}

---

Another way to explain the modulus operator is like this, in a not-so-decent coding method:

Code:

---

function get_remainder(number, value)
{
	temp = int(number/value);
	return(number-value*time);
}

function another_function(parameters)
{
	some_var = 160;
	// ... more code above here
	some_var = get_remainder(some_var, 30); // returns 10 and the same as
	// some_var %= 30; // also returns 10
	// ... more code below here
}

---

Although code like this is meaningless, this is the basic algorithm behind it - it's not all that complex either.