Where can i get some free xbox 360 games?

i have tried points 2 shop and rewards 1 and gaming lagoon and prizerebel and it takes years to get points. i have roboform and most of the stupid offers dont credit. rewards 1 never workd for me prizerebel works pretty good but gives u credit every 10 times u complete an offer. i tried all the freebie sites but i dont want to use a credit card plzzzzzzzzzz help