microsoft mahjong, how does the scoring work?

When I changed the date to the 20th and started the app, the counter was back to '0/31.' Again, nothing I could do would make the counter register my playing. Finally, I gave up, but figured I'd finish out the month to see what happened.

After completing a challenge on the 19th, no matter how many challenges I replayed, the counter remained at '18/31' and wouldn't budge no matter what I tried (restarting the app, completing each challenge again, failing each challenge). The counter was going up each day through the 18th (the last two days of which I had already completed all 3 challenges on).

I backdated to each day starting at 1/1 and completed the match/score attack challenge on each day. What happened to me was that I had previously completed all 3 challenges for 1/17 through 1/22. Another issue that I ran into, and which prevented me from actually earning this yesterday when I was attempting to do so, is this: the program may glitch if you are manually changing dates if you have previously completed all 3 challenges for one of the days. This is unlike the corollary achievement in Minesweeper, which can be earned on any actual day, as long as your device time is set to the last day of the month. Something that's not made clear in this solution is that, as of now anyway, if you're doing this by manually setting your computer's time, it appears that you still can only earn this achievement when it is actually the last day of a month. I encountered the same problem that Davehx was having. I'd recommend doing it in a February as that's the shortest month of the year. When the final date's challenge is complete, the achievement will unlock. Work all the way up to the final date of that month, in order. Complete a challenge, close the game, and set the date to the 2nd. SOLUTION UPDATE If you want to go for it the fastest way, set your computer calendar back to the 1st of a month you have not completed any challenges in. This method can be used on any day of the month, so if you start the game on the last day of the month, you could unlock it the same day. Repeat this until you get to the day that you are on and then finish it normally for the rest of the month. Open the game back up and complete another puzzle for that day. After that you need to close the game and then set the date for the second of the month. If you're starting this after the first of the month, then you can set your date back to the first and complete one puzzle. You will need to do this each day of the month. Simply come back each day of a month, starting on the first, and complete at least one puzzle each day.

Microsoft mahjong, how does the scoring work?