Yes, i saw that for multi touch i need to put the ID of each touch, but i don't know how to get the ID of each touch, how do i know this?
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You can use Touch.TouchID expression in "On touch start" event. Check out this demo:
howtoconstructdemos.com/air-hockey-game-template-for-two-players
Or it may be easier to use Touch index. You can loop through all active touches and get their coordinates:
Repeat Touch.TouchCount times Create particles at (Touch.XAt(loopindex), Touch.YAt(loopindex))