NO!
Alot of Terms Of Use Say Cheat engine & other hacking engines are ILLEGAL! Do Not Buy This EVER AGAIN if it tries to install a trojan horse that'll Terminate Your Windows........
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Yes, they are legal.
The only exception may be if you enter a game competition for money that requires you to sign a legal document guaranteeing that you will not cheat.
No, it is not illegal, however, if you use it on an online game, you could possibly get banned.
I hope this helped!
And It Will Probably not work for online games either
Dude no. It wouldn't be illegal. For instance, GTA San Andreas fun game. Rockstar Games put cheatcodes in the game purposely.