I don't know, but I've had the same problem with that level when I first started playing that puzzle game. On level 24, all you have to do is push the box without pushing it into any hole, or watch a walkthrough of that puzzle game. It works for me every time.
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Level 8: You'll need to move your yellow character and push the yellow box down passing the magenta box. Then, move your magenta character and push the red box to the right through the gap where the empty yellow space is. Finally, move your cyan character and push the blue box to the left through the other gap on the left where the empty magenta space is.
Fun lava/water puzzle game though, but I'm not sure how to pass level 12. How do I keep the small gap from turning into a one-square wall in the middle where the numbers disappear to zero?
Level 9: Jump over the springs without destroying them, then go to the medium size changer on the left-hand side to shrink your character to medium size. Next, jump on a trampoline to get to the platform on the right-hand side by pressing the up arrow key to jump while on a spring to go higher. Jump on the two platforms without falling to get to the small size changer to shrink your character to small size. Finally, use the springs again and jump to go higher to reach the exit portal.
And remember, springs can be destroyed at large size.