a needle in a haystack

Scramble through the haystacks to find a single needle.
There are 10 levels of difficulty;
and the elapsed time can also be displayed, so you can compete for time.
This is a game that tests the delicate movements of your fingers.
It's a great way to relieve stress.

In the training level, the needle flashes in red, so you can find it easily.
Slide the needle upward with your delicate fingers.
Once you get used to it, you can gradually increase the level.

As you go from Easy to Hard, the amount of hay covering the needle will increase.
The size of the hay becomes smaller and smaller.

It's like looking for a needle in a haystack. That could take 24 hours!
Then you better get to it now!

"Needle, haystack" is also used to describe the usage of programming languages.
Examples
in_array(needle, haystack)
strpos(haystack, needle)
The collection of data is the haystack, and the data to be searched is the needle.
Is there a needle in haystack?
Where is the needle located in the haystack?
And so on.