Couple of interesting puzzles i got from LancerLord lately.
Grain Strain Puzzle:
Make use of the devices at the bottom to transport all the grains to the bucket within the time limit.
After a cycle, repeat the same puzzles with the time limit reduced by 10 secs.
Can be quite addictive!
Move all the pieces to the lower right corner using ur mouse to drag and drop.
Something like the tower of hanio.