I received something too, but thought it was just a "trial". I just skip it,sorry... 
How to challenge players in battle
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go to play in the menu bar left hand side . click puzzle battle . then press start when a new page opens
Sep 18, 2019
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#4
AnukarssaDutta2005 wrote:
go to play in the menu bar right hand side . click puzzle battle . then press start when a new page opens
- Left hand side not right hand side
- He's asking how to challenge specific people btw, your way is just putting out an open seek like in live chess
Replying to the OP, I think they accidentally released it for the moment, then rolled it back. A similar thing happened with "Learning" (in puzzles) a few months ago
I got an alert this morning, didn't feel like taking a screenshot, but it said that now you can challenge members in puzzle battle. I went on it, but I didn't see an option to challenge someone.
How do you challenge someone, if the feature is added?