Trigger ONCE condition block

[blurymind]

I am not entirely sure how it works internally, but to the end user this is what it does:

Trigger once while true
Turn an ordinary event (which is tested every tick) in to a trigger. For example, if an event plays a sound when lives equals 0, normally this event runs every tick. This plays about 60 sounds a second and would sound pretty bad. Adding Trigger once while true after the other conditions makes the event run just once when it first becomes true. This makes the previous example only play a sound once the first time your lives reaches 0. It must be the last condition in an event.

The event sheet sort of forces “trigger once” to be the last condition in a conditions container. If it is not- then it colors it in red- making it disabled.

Another thing you can do:
If you run the game, it wont run and a dialog will tell you that trigger once should be moved to the bottom. It’s a small price to pay for the benefits it brings to speeding up workflow.

Their official youtube channel has a very good explanation in where it is useful:
youtube.com/watch?v=S5NeuIMqFH0

I have to admit that the first thing that struck me is that I need to create more logic in gamedevelop in order to trigger once - a new variable,a new condition and a new action. 3 blocks. Trigger once does it in one block.