If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Help Phineas and Ferb to break Dr Doofenshmirtz's cunning plans in the alternate dimension! This time they will not act alone, Candace and Perry the Platipus will help them on their way. Collect as many cogwheels as you can. Remember that the time is limited, so be quick!