What is the right gesture?

Hi,

I am building an app with a grid of letters (let’s say a ruzzle-like). I am trying to find the right gesture: when user touch/swipe or anything the letter it is selected and the letter turn red and it is selected. So you cannot use it again…etc.
But I can’t find the right gesture: is it pin or touch or click???
And, does the “on-release” gesture event exist?

Thanks,

Stéphane.

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