Level 1 Hints

On the grid from 1-16

1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16

1) On stool near lab setups.
2) In first drawer in bookshelf to the left.
3) Under kitchen dresser.
4) Under stolen dragon skull near chalk board.
5) In between books on middle shelf.
6) Under witch hat in corner.
7) In locked cabinet.
8) Right under painting disguising itself as a name panel.
9) In locked cabinet.
10) Under cheese grater in kitchen.
11) Right by the summoning board.
12) In locked cabinet.
13) Under open book on shelf to the right of the cabinet.
14) On top of first chalk board.
15) On the wooden base of the lab setup under mug.
16) On barrel near the entryway.

The completed picture of the puzzle is visible by pressing the "Big Red Hint Button".

It most certainly works. Be sure to click the golden orb when it is complete.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2809229369


How to eat soup:
1) Pick up bowl
2) Bring bowl to soup
3) Use ladle to fill bowl with soup
4) Take bowl of soup back to the table
5) Look for spoon
6) You will find it in the spoon drawer after a bit of force
7) Pick up spoon
8) Bring spoon to table.
9) Eat soup by clicking place mat
10) Remove key out of the bowl
11) Pick up cabinet key

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Level 2 solutions (CW and CCW are likely swapped from my puzzle update, and the rotations matching up with the animations).
1) 2CW, 2CCW, 2CW, 3CW, 3CW
2) 2CW, 2CCW, 3CW, 2CCW
3) 3CW, 2CW, 2CW, 3CW, 2CW, 2CW
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Level 3 Slitherlink solution

Convention for white placement based on number cell
U
L # R
D

2 RD 2 UL 2 UR 2 LR 3 URL 2 DL
3 ULD 0 1 R 3 RDL 1 L 2 UR
2 UR 2 DL 1 D 1 U 1 D 2 RD
1 D 2 UD 3 URD 2 RL 3 UDL 2 UD
3 ULD 2 UD 1 U 0 2 UD 2 UR
1 U 2 UR 2 DL 2 RD 3 URL 3 RDL