So do you remember Season 2: Episode 10 where Stanley Pines activated a portal, which caused some gravity annomalies? Turns out that while that was happening, Mario was trying to escape from Gravity falls underground, and suddently, the level went out from the ground and into the sky. In the sky, security would check if the person is a real gravity falls resident. Thankfully, he found a mystery mushroom with a Dipper costume inside of it. But when he reached in, he realised that it was the 4th journal: How to get out of gravity falls in case weirdmageddon ever did happen.
Join Dipper as he goes through some challeging weird obsticals made by "FastLikeUNO", seeing if he could make it to the flagpoll, without getting hit with weirdness.