Your trigger doesn't fire only once. It fires all the time, as long as any unit of player 12 enters the region. The problem why you think it fires only once is because the leaderboard shows value "Lives - 1". So if Lives == 10, then your leaderboard will show number 9 there (10-1) all the time. You do not change the value inside variable Lives. You only use it as a part of calculation.
Hence you get the same value and you thought the trigger fires only once.
There are some other things. Look at the order of your other actions - you first remove the unit from the game and then you use it to damage another unit.
I changed the trigger a bit:
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Untitled Trigger 001
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Events
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Unit - A unit enters End Region <gen>
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Conditions
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(Owner of (Triggering unit)) Equal to Player 12 (Brown)
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Actions
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Unit - Remove (Triggering unit) from the game
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Set Lives = (Lives - 1)
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Unit - Set life of Lives 0005 <gen> to (Real(Lives))
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Leaderboard - Change the value for Player 1 (Red) in (Last created leaderboard) to Lives
First of all, you can see that I modify the value in variable "Lives" by decreasing the value by 1. I also modify health of Lives 0005 to the value saved in the variable Lives (I presume they should have same value). Then I also update the leaderboard with the value.
Lives variable is an integer variable, but health of the Lives 0005 unit is in reals. To be able to use the integer variable where reals value is needed, youi can use the "Conversion" function - "Conversion - Convert integer to real".
That will solve the issue at hand, but not the "for all players" part.
What you probably want is an MPI system (Multi Player Instanceable system) - that means a system which works for each player.
This is what I presume:
- Each player has his own Lives 000X unit
- Each player has his own Lives.
What you will need to do is get a Unit array and change the Lives variable into array. Remove the "player equal to..." condition from your trigger.
Every MPI system uses "Player' number" (e.g. Player 1 (red)'s number is 1, Player 2 (Blue)'s is number 2, etc.) as an index for the arrays. Since each player has different number, you can never overwrite data of one player by datas of different player.
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Untitled Trigger 001
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Events
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Unit - A unit enters No region
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Conditions
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Actions
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Set Player_Index = (Player number of (Triggering player))
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Unit - Remove (Triggering unit) from the game
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Set Lives[Player_Index] = (Lives[Player_Index] - 1)
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Unit - Set life of LivesUnit[Player_Index] to (Real(Lives[Player_Index]))
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Leaderboard - Change the value for (Player(Lives[Player_Index])) in (Last created leaderboard) to Lives[Player_Index]
What this trigger does is that it first gets the players number of the player whose unit entered the region (= the triggering player) and save that value into PLayer_Index.
Then in each array it will use the Player_Index as an index.
Last but not least, I changed who you show the modified value. Now you don't show it to Player 1 (Red), but to the player who fired the trigger.
Do note this important thing:
You need to initialize your Lives and LivesUnit arrays with values and units - for example at map initialization, else nothing is there. So something like this:
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Untitled Trigger 002
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Events
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Conditions
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Actions
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For each (Integer A) from 1 to 12, do (Actions)
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Loop - Actions
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Set Lives[(Integer A)] = 10
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Set LivesUnit[1] = Lives 0005 <gen>
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Set LivesUnit[2] = Lives 0004 <gen>
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Set LivesUnit[3] = Lives 0008 <gen>
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Set LivesUnit[4] = Lives 0015 <gen>
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Set LivesUnit[5] = Lives 0014 <gen>
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etc.
Map initialization
