This is only plugin for Stellio Player. You need to install the player first. You don't need to enter a code if you purchase Unlocker. Just install and open Unlocker, that's all! Even if you uninstall Stellio Unlocker, nothing bad will happen. You whenever can download Unlocker for free if you have bought it....
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The game follows both Sonic the Hedgehog and Knuckles the Echidna in their respective quests