It's no more and no less than three of the best 3D platformers ever made.
Super Mario 3D All-Stars Review – Nintendo Times
SuperPhillip Central: Super Mario 3D All-Stars (NSW) Review
Super Mario 3D All-Stars review: A bare-bones nostalgia warp zone
Super Mario 3D All-Stars review: A bare-bones nostalgia warp zone
Super Mario 3D All-Stars Review: A Tour of Gaming History
Super Mario 3D All-Stars review: A bare-bones nostalgia warp zone
Review - Super Mario 3D All-Stars - WayTooManyGames
Super Mario 3D All-Stars review: A bare-bones nostalgia warp zone
Super Mario 3D All-Stars review: A bare-bones nostalgia warp zone
Super Mario 3D All-Stars review: Not even Sunshine can ruin this collection - Polygon, super mario 64