With the addition of the new Treasure Cove event, I'm getting into the groove of popping into the game every 15 minutes during the day, And let me just say, I LOVE the amount of timing information this event is giving us. Not only does it have an actual real-time counter (though it does bug out occasionally due to being on an inactive tab, reloading is quick and painless!) but it also gives us a nice little notification bar when the cooldown is up!

It got me thinking about the February "flirt" notification bar, which is kinda wack bad in comparison. You get a notification if you're slapped! ...At any point between 0-15 minutes until your next flirt. There is unfortunately no notification scheduled for when you can actually flirt again, so you have to rely on memory. Every player-written guide for February recommends setting timers every 15 minutes.

I think it would be beneficial overall to alter the way the notification works. Instead of putting a banner when a player is slapped, put it when the player's flirt cooldown is over. It can continue to say on the banner whether you succeeded or got slapped. For example:

Your flirt time with [lion's name] is over! Her pride leader, [King's name] (optional), did not stop you in time, so you were able to enjoy every second. (+1 Heart Shell) | [Flirt!] [X]

Your flirt time with [lion's name] is over! Unfortunately, her pride leader [King's name] slapped you just when it was starting to get good. :( | [Flirt!] [X]

Your flirt time with [lion's name] is over! Her pride leader, [King's name] tried to stop you and failed, so you enjoyed all the time you spent with her. (+1-3 Heart Shells) | [Flirt!] [X]

* Clicking [Flirt] will redirect you to the event page to flirt again. Clicking [X] dismisses the notification without redirecting you.

And if you end up checking back on the event page before the cooldown is over, whether or not you failed or succeeded could be displayed there ahead of time if the other king has already responded.

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My other suggestions:
Masterpost here