Sleeping Dogs is an open-world action-adventure game developed by United Front Games and published by Square Enix. The game was initially released in 2012 for PC and consoles. The highly compressed version of the game allows players to experience the thrilling gameplay and stunning visuals on lower-end hardware.

The original Sleeping Dogs, when compressed, can fit on a single USB stick. You still get:

In theory, a highly compressed game uses advanced archiving tools (like WinRAR, 7-Zip, or specialized repackers) to reduce file sizes drastically. This is done by removing redundant data, lowering audio bitrates, or compressing video cutscenes.

for PC, you are likely referring to a "repack." These are versions of the game where files have been significantly reduced in size to make downloading easier for those with slow internet or limited data.