Boxy Tap

In Boxy Tap you have to calculate the combined size of two boxes.

Then you have to figure out witch one of three other boxes matches that size. One of them are the size of the first two, the other ones are just there to give you a headache. Watch the timer, if it reaches zero you loose.

If you tap the wrong box, time will be subtracted.

But tap the right one, and time will be added. You can go on forever and ever.

Or can you?