Big's Big Fishing Adventure 3 is a complete game being developed for a Child's Play Charity fundraiser. It is a collaboration of fans working to tell the lost story of Big the Cat during the events of SEGA's 2001 video game "Sonic Adventure 2".
Character and gameplay trailers
Knuckles the Echidna Trailer (Faulerro)
Dr. Eggman Trailer (Mike Pollock)
Miles "Tails" Prower Trailer (Emi Jones)
A trial version of the game was released on April 1st 2016, boasting a unique branching story and gameplay back when we were initially developing the game. A lot has changed since then, and as such it is no longer in any way indicative of the final game.
If you still wish to give it a go, you can do so by clicking the link below.