RARE. Vintage Slime Monster board game by Mattel from 1977 is a near complete set, has the Slime monster, spinner & original slime container, as well as remaining game components, game board is in good shape, some dirt spots & Box shows normal shelf wear from age.. Missing one purple player & instruction sheet. COLLECTORS ITEMS.. With a horror and monster theme, 2 to 4 players can immerse themselves in a spooky adventure filled with challenges and surprises. This classic board game is perfect for collectors or fans of traditional games looking to add a nostalgic touch to their gaming experience. USPS SHIP.