recognized last card, go to next screen behavior

Hi,
Does anybody know the behavior for this:
I make a kids game.
If kids done everything well on a page, such as: put the cards on the right place and so on...
But only when they are done to put the LAST card on the right place, i need a behavior that the system know (recognized) that the child have all cards placed and there are no more cards, and can go on to the next screen.
If anybody knows this behavior, please also tell me where to put this behavior.
Thanks
Does anybody know the behavior for this:
I make a kids game.
If kids done everything well on a page, such as: put the cards on the right place and so on...
But only when they are done to put the LAST card on the right place, i need a behavior that the system know (recognized) that the child have all cards placed and there are no more cards, and can go on to the next screen.
If anybody knows this behavior, please also tell me where to put this behavior.
Thanks
Comments
Where i have to put them?
And thanks for your answers.
Does anyone knows a tittle i can search for this specific behavior?
Asymptoteell
And for all other persons, thanks for your help!