A side game to Metal Gear Solid. It has a lot of activities that expand upon what was found in the VR missions training mode in MGS, however many are very different to help justify this as its own game. As a standalone game, it's not the best, but as a companion piece to MGS, it's really nice.

i like to think the canon is that this was the training raiden did

i mean its alright i guess

The Real Metal Gear Solid V: Ground Zeroes

I spent a ludicrous amount of time replaying the Ninja levels back when this first came out.

Its just boring challenge missions, good for a couple hours of entertainment but not much more than that. It was bundled for free with my copy of MGS so cant complain too much though.