Crazy Dave's Twiddydinkies is Crazy Dave's shop and is located in the trunk of his car. The player gains access after finding his Car Key at the end of level 3-4. On iOS versions, the Car Key is given to the player by Crazy Dave after More Ways to Play is unlocked on level 2-2. Once in every level set (Fog and Roof) afterwards, new merchandise will be added. The player can purchase more seed slots, plant upgrades, new defenses for the Pool and the Roof, Zen Garden items, upgrades, various House Blueprints (Xbox Live Arcade and PlayStation Network only), and Mini-game Packs (iOS only).