Which is longer?

Level goes up each time you answer a question

Since the emergence (mm unit, cm, m, km various) in length more than one group of 2 (A, B) to

Quiz format is a game of hit the group with more that the sum (B or A).

When I thought long and total length of the latter group of A, please press the "A> B" button at the bottom left.

When I thought long and total length of the latter group of B, please press the "B> A" button at the bottom right.

If the wrong even once the game is over.

Level goes up each time you answer a question, will become increasingly difficult.

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