The Stash also sells aesthetic upgrades such as character outfits and different jetpacks. Most of these items do not alter the gameplay in any way, though alternative jetpacks can be useful in achieving some of the missions (such as travelling a distance without harming any scientists). Limited use utilities are also for sale, as are gadgets and vehicle upgrades. Gadgets provide permanent enhancements for the player, but Barry can have only two gadgets equipped at any one time, however, they can purchase an item that permanently increases that number to 3. Players can also access their profile from within The Stash, view achievements on Game Center or Google Play Games, and purchase coins with real world money.

At any time in the game, the player is provided with three missions, such as high-fiving (running past) a certain number of scientists, avoiding coins for a set distance, flying close to a certain number of zappers, or having a near miss with a set number of missiles. Each individual mission carries one to three stars, depending on its difficulty. When each mission is completed, the stars are added to the player's experience level and a fresh mission appears (unless the player has enough missions to make it past level 15). Once the number of stars required for the experience level are obtained, the player's level increases and a coin reward is given.