Tim Tang Test (longest and hardest online puzzle)
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Pretty cool. Seems like it would appeal to chess players.
Whoa I'm on level 21 now!
Something is wrong with the link for me.
I came across this , try it out.
www.timtang.com/ttt/
If you can get the hang of it , It can be fun.
Don't give up so easily, and check out the facebook group for it , there are some good hints if you are stuck. Personally I made it to Level 5 or 6, and forgot to save the answers, now I am too lazy to re-do them. But check it out