Sonic Adventure - Upgrades FAQ. b) LONG HAMMER Location: Go in Adventure Mode with Amy and aboard the Egg Carrier. Company of heroes 2 wiki. After 'Hot Shelter', replay the mini-game 'Hedgehog Hammer' a second. This guide will explain, in detail how to obtain all of the character upgrades in Sonic Adventure 2. This includes the upgrades for Sonic, Shadow, Dr. Eggman, Tails, Knuckles, and Rouge. Included is a short description of each item and what their functions are, as well as where they can be found.