This is brain out solution for stage 21 to 40. If you want to challenge yourself, then don't look further because it will spoil the fun. I am writing this to help people that got stuck in one stage for too long.
1. Stage 21
Click multiple time on the fire at the cigarettes until it's gone.
2. Stage 22
Put the 3 coins into the piggy bank. Then keep pressing the piggy bank until it breaks.
3. Stage 23
Pull the cloud in the photo frame and place it behind the sun, it will produce an egg.
4. Stage 24
With 1 cut, you can cut it into 8 piece equal parts if you fold it properly.
5. Stage 25
Zoom in the rock, then you can see more ants on the rock.
6. Stage 26
It's binary code, so 1001 is 9
7. Stage 27
Move the small icon from the outside to the exit.
8. Stage 28
All the people including the people on the traffic light.
9. Stage 29
Click the cloud and it will start to rain. Then 2 hidden animal will appear.
10. Stage 30
Move the matchstick to be like the picture above
11. Stage 31
Click both people at once. You can save both of them.
12. Stage 32
Move the word and the cloud away. Then the sun will appear and melt the ice.
13. Stage 33
Move the carrot to the rabbit
14. Stage 34
Expand the thing that look like a boat and it will become big enough like a bridge
15. Stage 35
You can use the same number twice, so it's 3 + 3 + 6
16. Stage 36
Move everything into the box, including the instruction at the top
17. Stage 37
Pull the mole over to the mallet
18. Stage 38
Rotate your phone upside down, the key will fall out from the bucket
19. Stage 39
The number is actually continuing from the previous 2 line, so the total is 39
20. Stage 40
Some object is placed horizontally and some is very hidden especially the candle. It's hidden in the cup cake.
Continue to stage 41 - 60