this is actually very easy just use
condition
player has at least 1 kill
action
subtract 1 kill
add 1 gas
and preserve trigger
then if you have like maybe 30 kills at one time and you want it to go faster (i dont think you will need this) make all the 1's into 2's
also if you need to keep track of kills just sue a leader board or death counts
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☼Loop-Hole☼
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