Algodoo

I found that i can unlock any door with any card. Eg: card 7 door 2 opens

no, thats not how you do it, heres how it works
card 1 unlocks door 1.
card 2 unlocks doors 2, 1.
card 3 unlocks doors 3, 2, 1.
card 4 unlocks doors 4, 3, 2, 1.
card 5 unlocks doors 5, 4, 3, 2, 1.
card 6 unlocks doors 6, 5, 4, 3, 2, 1.
card 7 unlocks doors 7, 6, 5, 4, 3, 2, 1.
think of it like you are in a top secret military facillity, and youve got clearence code 4, you can only get as high as level 4, not 5, not 6 or 7, but if you had 7, then thats like an all access card.

you arent my subscriber by anychance?