Yes, it is against the Roblox terms of service to use cheat engine. It isn't illegal in the sense of that you could get arrested or sued for using it, but it can get your account suspended or banned. Despite this fact many people still use cheat engine because it is hard to solidly prove that they are using it.
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You shouldn't use cheat engine on Roblox, you could get banned if you are caught using it.
It is not possible to use the cheat engine to get Robux on Roblox. You can use it to get money in tycoons (although that can get you banned).
No one should, but if you do so, just use a standard cheat engine.
You don't, unless you want to get banned. Using cheat engine to cheat on Roblox is against the TOS and could very well get you banned. Also attempting to cheat will not work most of the time and does nothing.
There are none, but you can use cheat engine.