Cheat Engine

[xxhehe]

01
add freeze types:
"From minimum to maximum" type lets you enter a minimum/maximum value for freezing. So the value can change at any time (increase and decrease), but will never be less than the minimum value and will never be more than the maximum value.
by ArtMoney

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02
add Stealth mode.:
Stealth mode. CE disappears from the process list and from Windows list of operating system. Some games detect CE when you are trying to cheat. Enable the Stealth mode and the game will not detect it.
by ArtMoney

[ParkourPenguin]

1: That's partially implemented already. Click on the small whitespace just to the right of the checkbox and a green up arrow / red down arrow will appear, signaling whether the value is allowed to increase / decrease respectively. If more advanced behaviour is necessary, use Lua or code injection.

2: That's not a very sensible feature for an open-source program. Anyone that wants to detect CE can just look at the source code to figure out how CE is hiding itself. If you want a UCE, compile it yourself and don't share it with anyone.