No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. Reviews and prices only.

METAL SLUG 4

METAL SLUG 4 is an action shooting game released by SNK in 2002 and it marks the fifth title in the METAL SLUG series. In addition to Marco and Fio, brand new characters Trevor and Nadia have also joined the battle! Use new items effectively and get the highest score with the new Metallish System!