Here we can post the sidequests and their solutions

Q1: How to force the cat out of its hole? Zelina in a house in New Haven town.
Buy a ball of wool in Dilldel; give it to the cat. I think that's all that's needed, but I got transported to Claw Island before I could test whether anything else has to be done
Q2:Where is the shell stolen by the rogue Raflesias? Wickmaya in a house in Dilldel
Go about 2 screens south of Dilldel, on the left side where you go down some narrow steps to a waterfall and large pool. You know you’re in the right place because there is now a large group of raflesias. The shell is in the pot
Q3:Can the hunting season start with a good horn blow? Man in a house in Dilldel.
Get the horn as a drop from a fight on the Rock on your way up to Dilldel. In the house where you get the quest, select it from the Items list.
Q4: Find the hideout of the renegade elves. Llodra in Dilldel
Go to the Watchtower on the world map; blow the hunting horn and check the notice board which was behind an NPC; this directs you back to Rock. Take the east path near the entrance, round to the waterfall. Inside you need to find the key which opens the gate for the last section. The key is in that location
Q5:What does Bacchus want? Didn't note the guy's name. In the Shrine on the Ellewyr world map
Put in the grapes you got as a reward for Q11
Q6:How to clean his glasses-Zuma-Windheim
take the mirror magic tissue to him-it can be found in the first mirror you see in necropolis, behind the save sparkle
Q7:Where have the Windheim folks disappeared? House in windheim.
On the Claw island world map, go down the west side to the bottom and click on one of the small lakes. Enter a new area; follow the path round, and click on the people there. Be prepared to be slaughtered by a tough fight.
Q8:Who stole the precious tablet? - Claw island shrine
Fight the enemies on the world map until one of them drops a broken stone. Give it to Thor in Reven Niega who will repair it
Q9:Get all 4 elementals for Susanna
Earth elemental on the Rock, water elemental in Reven Niega, fire elemental in Titan Cave, air in Hallberk underground
Q10:How to open a long locked door? Titan Cave
use the sacred ink on the scroll next to it
Q11:Vintage wine-Laurie-Hallmark: help Laurie make her wine special
fight one of those gargoyle-type enemies south of Hallmark and you have to have Susanna summon her earth elemental in order to get the truffle
Q12:Break the curse of silence-Tanja-Hallmark
Tanja owns a bookstore with a basement that is cursed.In order to lift the curse you will need to play 3 magical instruments:the harp( in Reven Niega, it's in the red chest to the right, very near to the entrance), the ocarina(oracle's place), and the drum(oracle's place)
Q13:The treasure of the Nords-Calysthene-Hallmark
Grab the cleaning cloth from the first mirror you find in necropolis and give it to Zuma.He then reveals the place where the lake is.From this spot go 10 steps N and 3 E and dig for the treasure.After that return to Calysthene
Q14:Lost letter-Silas-Hallmark:where in Hallmark is Silas' letter?
The letter is floating in the water in the underground section of Hallmark castle. Exit and re-enter that map a couple of times, and each time the letter moves closer to the ladder. Continue until you can reach it.
Q15:Memories of a philosopher:Frode-Windheim
Use the Philosopher's Scroll next to him