How do I make my bullet go through every instance of a group and damage them once ?
Actually, when i shoot, my bullet is hitting ennemies each frames, and they die fast 
My way to approach this is to give each enemy an id, and the bullet a structure variable. When the bullet is in collision with the enemy, check if the enemy id is a child of the strutcure. If it’s not, add the id to the structure and give damage to the enemy.
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Here is how I tried (I’m sure what I did makes no sense don’t be mean ahah) and of course it’s not working (sorry this is the first time I go into things like that in gD)
Aside from what MrMen suggested, if you just want to prevent that the collision with the bullet is constantly checked, you can add a ‘Trigger once’ - condition in the same block as the ‘bullet is in collision with Enemies’ condition.
This is the first thing I tried, but the bullet isn’t hitting all enemies, when it hits one, the bullet ignores the enemies behind idk why
That may not work in this case. If 2 bullets strike enemies, or multiple enemies hit by tthe same bullet at the same time, then only one will be registered
Unfortunately all that’s doing is increasing the size of a number. I think you can get away with the following (untested though) :
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It works so well thank you for your time, you save my project !