The document discusses 25 killer console exclusives from different generations of gaming consoles. It provides details on iconic exclusive games that helped define their respective consoles and generations, such as Super Mario Bros. for the NES, Metroid for the NES, Sonic the Hedgehog 2 for the Sega Genesis, and Halo 2 for the original Xbox. These exclusives helped drive sales for their consoles by providing flagship franchises and titles that could only be played on that one system.