100 Doors 2 Level 69 Guide:
Pick up the deflated balloon on the ground and place it on the helium tank.
Pick up the string and hook in the box. Tap the balloon to inflate it. Use the string on it, then the hook on the bottom of that.
Drag the balloon string+hook all the way down into the hole and let go. You will see the keys on the hook.
Take the keys and use it on the door.
Proceed to the next 100 Doors 2 level!
Hit like if the 100 Doors 2 Level 69 walkthrough helped you! Thanks :)