Super Mario 64 ✦ Fresh & Certified
: Running around the post that the Chain Chomp is tethered to three times will set it free, allowing it to break the bars behind it and reveal a Power Star.
While the game does not have a formal "post-game" save state (it resets to the castle after the final Bowser battle), reaching 100% completion unlocks specific rewards: Super Mario 64
Check out the full journey to unlocking the post-game rewards by collecting all 120 stars: : Running around the post that the Chain