The objective is to move all of the balls into the corresponding area of the clock.
The balls can be moved vertically or horizontally, but the lines in the numbers on the clock act as barriers and they cannot be crossed.
You also cannot jump over other balls or place one ball on top of another.
Slide the balls to move them, and touch the arrows to change the time on the clock.
This is a clock, so the numbers that can be displayed vary depending on their position.
To move the balls, you need to change the numbers so that the part that is creating a barrier is removed.
Figure out which numbers need to be displayed in order to move the balls horizontally.
For example, '2' and '5' have sections on their sides with no barrier, so lining them up next to each other will enable you to move balls across.
There are only three numbers that can be displayed in the left-hand position: '0', '1' and '2'.
The only way to move balls from this area is to set the number to '2' and move them from the bottom.
First move the B balls so that there is space for the A balls to move into.
Continuing on from hint three...
Place the B balls in the top now, and move the A balls along the bottom.
The answer is as follows.
Set '23:57' and blue move to right, red move to left, red move to top.
Set '12:10' and blue move to right, blue move to bottom.
Set '21:21' and blue move to right, blue move to right.
Set '05:21' and red move to left.
Set '22:51' and blue move to right, red move to left, blue move to top.
Set '21:21' and red move to bottom-left, blue move to right.
Set '05:21' and red move to top, red move to left.
Set '21:21' and red move to bottom-left.