Sorry Retr0id I took your spot ;) It's a fun little game, turbidimeter! Request: it would be nice if the page showed the history for the best winning texts and their hashes. I don't know what the hash or string was before Retr0id overwrote it with his winning entry. For the curious:

0000000000f2b100124723856e7b19f92db367453f8939b3b3aace655a81d488 was the hash of the winning text "Retr0id was here" as of ~30 minutes ago

0000000000d98482cd72551c39c0233243a4878672039348417aaf69143d8d65 is now mine for "m at zorinaq dot com wins" this took about 2**40 SHA256 operations to find.

I used to have a GPU farm for Bitcoin mining back in the day... which would have been perfect compute hardware for this game, but I am ashamed to admit I do not have any GPUs anymore. So I had to fall back to writing a quick multithreaded Python script and ran it on 3 machines (22 CPU cores total) while I was having dinner.