I managed to get a top 10 high score for Matlal's Jewels. I was hoping the achievement would unlock with the sp prize alert, but no such luck. Does that mean you have to have one of the top 10 scores at the end of the month or something?

[edit] Unlocked Matlal's Jewels High Score! Have one of the top 10 high scores in Matlal's Jewels! :D

I think they go out when the check happens after the end of the 3rd day of the month, so it should unlock in another few hours. (I know the check for different games happens at 2, 3 or 4 am Subeta time so that varies a bit.) Congrats! c:

Oh awesome, I hope that's the case! I'm not sure it'll be in the top 10 for too much longer. Thank you! :)

Good luck staying up there til it hits! I remember that's the reason the achievement takes a few days to work, to make it tougher to win with low scores on the first day of the month. x) No worries! c: