The puzzle clue is "Sigh Fur", which becomes "cipher" when pronounced. Look up the basic types of cipher, and you'll be on your way.
Congratulations on not understanding the concept of subtle hints. You may as well have posted the actual answer.
Need help beating 6-4(two types of trouble,ghost cats) in Spymouse. I haven't the slightest clue Can you help? Thanks!!!!
It may help you to know that the ghost cats can't see you when you're in the dark spots (there are 3) in this level. They will get confused and return back to their original position. Hope this will help you!