Board Thread:General Discussion/@comment-69.80.44.29-20150417194541/@comment-26044650-20150417215134

It's a pretty common knowledge how Muscle Cookie (along with Muay Thai Cookie) can get 100% invinicbility with the right treasures and boosts.

Essentially, Muscle Cookie/Muay Thai Cookie + Snow Blossom pet + Snow Blossom's Sparkling Crust (at least at +5 or the evolved form, Ice Scuplture with the Starry Sky, which gives the same 25% bonus ungraded) + Invincible to 70% of Obstacles Random Boost. You'll knock away all obstacles and all holes will be covered.

The last two treasures are up to you.

Oh, Muay Thai Cookie has an innate 50% Invincibility to Obstacles as well, even if his description doesn't state it.