What's the special day for the pirate treasure to appear on the islands of illusion? The brothers told me it's day 99, but I still see them as illusions.

(If you can learn this from somewhere else, just tell me where you learn it, and not what day it is).

Thanks.

Sorry, this is nor related to the original question, but I don't want to spam the forum with dozens of MM3 questions threads so I'll just let this be Misc Questions for MM3...

I just noticed I got this bug at the arena. I wanted to see whether the XP reward is for all characters or for each. So I finish battle 53, check my XP just before collecting reward. After I collect it, I notice my XP actually decreased.

Anyone know why this happened? I checked for next 2 battles. I did get xp from killing monsters, but lost XP when collecting reward.

My party is level 28-32. 6 guys + 2 hirelings.

This is a known overflow bug.
There is an unofficial patch for it made by Jeff Ludwig: http://www.jeffludwig.com/mm3/resources.php

Thank you both.

So how do I learn about the onesday? Is it written anywhere in the game or is it one of those keep-trying-till-you get-it-right puzzles?

I wish I could mark both of your posts as solutions, bu I can't :(
Since my original question was about the pirate treasure, I'll mark kmonster's reply as the solution...

A week in MM3 has 10 days, guess how they are called or simply click at the hourglass where you saw that it was day 99.

Oh yes, I know all that. What I meant is what's the way you learn that the treasure appears on Onesday? Is it a message on a wall somewehrer? A tavern rumor (I think I checked them all...)

This is a good place for some stuff. http://www.rpgclassics.com/

I finally found out the answer.

SPOILER
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One of the statues in cold Cavern tells you the answer if you get its riddle right.

Before entering arena,I note XP. Then do a battle and go out. I found XP was less than before.

Just fight the next ones. Monsters will get tougher and you'll get more XP (if you can survive it).

If you go in with 0 XP, how much XP do you have when you leave? Is it still 0, does it increase slightly, or does it underflow and give you far more than you need to reach level 200?

I will try.

The arena is totally optional, you're fighting for glory and honor. :-)

In one of the taverns you can hear what's the record in arena victories is, afterwards you'll get millions of XP if you manage to survive.

I start a new game,fight battle 1 in arena.go in with 0 XP.After that 1528 xp. Actually I found this bug when I have 31 arena wins perhaps.