To Misplay
I noticed the same thing myself.
There is a Bug with the 4 Leaf clover there (it switches forms & does not switch back)
It can be reset by going to any of the other 7 places where it respondes to the big circle riddle
and then avoiding that location in the entrace to Mages Guild it will then work normally
or remember that there is a problem there and you need to visit an other location where the 4 leaf clover works
To Adamski there is a missing Triger and Action found at all the other locations
I Will fix this bug in version 5.0 (UNLESS INFORMED OTHERWISE)
The Big Circle Riddle
My advice is to reload a save before you stop the Tower Clock
& wait till 60 days and 10 Hours the correct answer I believe
(this time is the solution to 3 quests)
1) Access to the 60 days Big Circle
2) Access to the store 8 to 12 O'Clock
3) Access to the treasure room 10 O'Clock
Secret Library the answer is in the Graveyard
This brings up my earlier advice on the need to always map the game to help you find missing area's
Remember that there are more entrances than just the gravestones
at the boarders as mentioned earlier check your maps they should
show an unexplored area on the level below ground level
My playtesting to solve all quests Also
On my part Solved one of the missing Runes (Gor Rune)
It involves doing something with the books in the library
But you will need a save before you have done anything in the libary.
Dont want to backup 3 days playing for this rune.
Here are the revised hints for the Missing Big Circle Riddle you seemed to need to solve the 3 remaining riddles
1st Missing riddle
In three styles
they exist, I
have only two.
put back which
is missed, and
I'll provide
you with
another clue.
Final Hint
look for colection of objects that is incomplete
2nd missing riddle
You're Looking
like a king
be sure to take
the fast shift,
and with the
right thing
you'll receive
my next gift
Final Hint
this took me 3 days and help from my sister. You want to dress up and take a ride.
the right thing was the part that's still not to clear it simply means be sure that the one
dressed up is the selected player ie right click on that adventurer first and that he/she is
the selected player.
3rd missing riddle
When in the
snake room
you mustn't
consume.
This Penance
feels like
a long painful
hunger strike.
Final Hint
this should not be do difficult think about where you saw snakes and a
colection of something you really needed.
I'm amazzed that you got chaos without the firestaff I tried but kept getting my party
vaporized so I decided I needed the firestaff. I knew where it was but could not get it until I
solved the circle riddle. it took me a week to complete as my food ran out.
What really made it much easier was first solving the 60 days riddle
Here is a sample of my work as you seen above with the 3 circle riddle
its been a labor of love and in all cases I have tried not to change Adamski original
text other that to try and make it clearer for the player to understand.
Original clue
Go back when
60 days will
have passed.
Revised clue
Return here
when sixty days
have passed.
That clue was strange a first as it was found before I got into the tower.
But it became clear once I had started the tower clock. I created a special
save just for that. Final correct solution is shown above.
in Addition here is the revised text once you pass thru that door
That's really terrific!
you have shown great wisdom and patience
to have waited all of sixty days to be here,
so that you can perceive the big circle.
Again I am Keeping track of what you have finished so I'm sure it all works
as Adamski had planned.
Finally thank you for offering to play version 5.0
Darth Mouse Dungeon Master
. Sadly, 22 days elasped when I solved it the first time. 
). I've got a message when I killed the specter ("you solved a difficult riddle"), but no rewards. Is there a link with this riddle and 
. The stairs maze gave me headaches, so I assume it's also a good one.
. That's my weakness, I didn't map the areas... During the entire game, I don't have to: most of the levels are very simples, and the "complex" levels have their own maps (drawn on scrolls or even on the walls). I hope that the OH EW RA spell will be enough to find the solution...