More Than a Memory: A Perfect Existence

More Than a Memory: A Perfect Existence is a hack of Sonic the Hedgehog 2 by KojiChao. It is notable for being one of the first hacks that had Shadow the Hedgehog as a playable character in place of Sonic, he also has a Chao sidekick named Mizu (In the vein of Project Shadow 2) and unlike Project Shadow 2, Shadow's sprites in this hack were incomplete.

As of May 19, 2002, there is only one known release of the hack in celebration of Kojichao's birthday. No new versions of the hack were released since then.