I have just found this awesome game. It's a flash minigame, and can be used as a practice for your irregular past forms lessons. Just pick the right form of past tense for the verb given, and each correct answer will fuel the rocket. Go and launch your rocket now!
It also provides you with the usage of the word.
Once the fuel gauge are full, the rocket will take off!
I'm really hoping that these games will make you more interested in learning grammar and doing exercises. Go try them now!