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The daily challenge gives you five comparisons to solve. Once they're done, you can move to Unlimited Mode and keep playing. Geography Mode offers a different kind of test, with countries, US states, and lakes to compare.
That's where Size It Up gets interesting. But it is another thing to estimate its real dimensions without an obvious reference, however familiar the object may seem. The game is a reward for the careful observer, not the quick answerer. Play a few rounds and test if your eyes are as good as you think they are.