How does Toad Rally multiplayer work?

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I was wondering a little because I read it's not real time but the other player is a ghost and I also never receive invitations - I always select the other players. There are also no waiting times and apparently the other players never give up?
If players are not playing at the same time, how can the end score be calculated immediately?
How does it work? Anybody knows?
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How does Mario run toad rally work?
Toad Rally is Super Mario Run's competitive mode, where you race through levels against other players, collecting coins and pulling off stylish moves to earn toad fans. (It's not strictly a race but it's race-like.) Your races against other players don't take place in real-time.How do you always win toad rally?
Super Mario Run tips to help you master Toad RallyHow do I get more Toads in Toad rally?
With little fanfare, Nintendo's flagship mobile game Super Mario Run added a brand-new multiplayer mode overnight to help address player concerns of lacking content. The new mode, Friendly Run, lets players face-off against people in your friends list in a a Toad Rally-esque levels.Super Mario Run TOAD RALLY TIPS - HOW TO GET 9999 TOADS!!!
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Images: Markus Spiske, LT Chan, Yura Forrat, Colin Lloyd