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I have Global arrayList to keep beside of block what user click (beside and same color).In this code it name "pastTemp"

Ps. The arrayList name "past" is build for keep block what I recursive to...

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I want to create games like this. And now I can check nearly of block click by user.(I use algorithm name "Floodfill")
But when it disappear I can't check which block must fall replace that...