Drag & Drop - Instant Feedback & Snapback!

Hello All,

I am developing this drag & drop interactivity where there are 4 drags and 4 targets. Every drag corresponds to one target. Activity does not has any submit button. when user places the drag correctly it sits on the target and a correct feedback is given. Everything till here was fine until....If the user places drag incorrectly then it should snapback to its original position and incorrect feedback should be given. I am not able to achieve this....

Any ideas sampels etc please ?

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