Hallway challenge

This is a hallway i built that i challenge you to get past also you can see a giant tower thats a tnt cannon if you go to it the entrance is obvious when you go inside grab tnt from the chest and go into the cannon fill the first three rings with tnt push the button and it will launch you to the top another thing there is a combination lock the combonation is x1x after you do that go to your right quickly and you will see the secret door.
x2x
43x

Additional Notes

P.S this world is a bit messed up and some things are kinda wacky and destroyed