Nasa hopes the mix of real data and fun will also inspire the planetary scientists of tomorrow.
"We really need the next generation of explorers," says Michelle Viotti, from the agency's Jet Propulsion Laboratory, which oversees Mars missions.
"And we're also accomplishing something important for Nasa. There's so much data coming back from Mars. Having a wider crowd look at the data, classify it and help understand its meaning is very important."
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