The IBM Color Graphics Adapter was capable of being controlled directly through registers instead of the BIOS. This enabled many interesting effects, like "shaking" the screen, displaying 8 colors in 320x200 through palette switching, or creating a rarely-used 160x100x16-color mode. Any game marked with this attribute "tweaks" CGA in some way to produce special effects, and may not display properly on modern VGA cards.

CGA (Tweaked) is part of the Video Modes Supported category.