ROFL how many hours did it take you to make the money triggers dude? You didnt need to change how many kills you have and copy the trigger 1000 times, a simple method:
Curent player kill score = at least 1
Set to 0 kill score, add 1 gas.
preserve trigger
It took me long enuff to delete them all lol.
One possible flaw to this system is if you kill 2 units it mite calculate as 1, so keep ur old system just in case, but it should be fine

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get rid if your old system and use nimadude's example, but use subtract 1 kill instead of set to and you won't have that 2 kills - one mineral problem