The compilation (also known as Metal Slug Collection PC ) includes the first seven mainline games (

was designed for the "quarter-munching" economy of 1990s arcades. Every pixel of its lush, hand-drawn animation was built to challenge the player, tempting them to spend just one more coin to see the next screen. In the original arcade context, "unlimited credits" were a fantasy. Survival required intense pattern recognition and twitch reflexes because the stakes were financial. The Shift to Unlimited Credits Metal Slug Complete