https://www.greenmangaming.com/games/teenage-mutant-ninja-turtles-shredders-revenge-pc/?utm_source Teenage Mutant Ninja Turtles: Shredder's Revenge (PC Digital Download) on sale for $19.12 when you apply voucher code COWABUNGA at checkout. Green Man Gaming XP Members may be eligible for additional savings, making the price $17.99 (discount automatically applied during checkout).