The item is not available on the STEAM marketplace.
Hamilton's Great Adventure - Retro Fever DLC
Hamilton's Great Adventure: Retro Fever
This map pack contains new levels that bring back the irrepressible charm, and also that daunting touch of hardcore difficulty, that could only be found in the 80’s. They are inspired by famous levels found in legendary NES titles and carry names such as It’s a me, Hamilton! and Dungeon #9.