this and Sonic Adventure 2 take place in the same continuity, Michael Wilson and Jody are the president/secretary Sonic talks to in the limo

Odd duck of the 'Portable' series. Different universe (as far as I can tell, at least), different graphics (blurrier somehow), and sweeping balance changes to returning weapons, which I found very off putting as someone who came into this directly from Silent Line Portable. For these reasons it may be hard to get settled in, but I found it well worth it. The branching mission structure, intense difficulty, and gritty story make this the ultimate send off to an excellent trilogy.