card.io might be a bit more popular than ArcGIS Explorer Desktop. We know about 1 link to it since March 2021 and only 1 link to ArcGIS Explorer Desktop. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You need ArcGIS Desktop to open MXDs but if they can export a PMF you can use ArcGIS Explorer. Source: about 2 years ago
First thing I tried was typed card.io in my web-browser to see whether it would bring me to a website associated with this game. Source: almost 2 years ago
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