I haven’t tried using Cheat Engine to modify single player games running in Windows, but I’ll be sharing this to you anyway.
The latest version Cheat Engine 5.6 is already available for download. The new version has some neat features and opens several new possibilities for plugins to do some neat stuff.

Changes made from Cheat Engine V5.5 to V5.6 include the removal of stealthmode, changes to poinscanner; the Resultcount is now comma separated, and etc.

There are also some bug fixes on this version like broken alt-key when the disassemblerview is focused, several GUI fixes for high dpi systems, Taborder fix for “value between scan”, etc.

You can download Cheat Engine 5.6 for free from the link below.

Cheat Engine 5.6 download link: ;
(Copy and Paste in your browser address box)

Update: 01/15/2011
The Cheat Engine has been updated to version 6.0. New features added include a new debugger interface (VEHDebugger), improved pointerscan speed, ability to compare to values of saved scan, 64-bit version compatibility, and more. There are also added fixes to known bugs, and etc. You can download Cheat Engine 6.0 from the link below. Just copy and paste it in your browser address box.

Cheat Engine 6.0 download link: http://goo.gl/bUij8

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