How to make doorways and keep your progress between scenes

DuChatNOT: Doorways and saving progress

Dial Puzzle

Lucid Stew: How to make a door code puzzle with moving dials

LadylexUK: Level linking, one way and two way doors

LadylexUK: A look at the doorway tweak menu

A two way swinging door

Level linking using doorways

Two way teleporting within a level

Use the microphone for game mechanics

A lever and door opening and shutting microchip

How to make a locked door puzzle with a stepping stone sequence

How to make a game mechanic with a block carry to a pressure pad.

An introduction to the doorway gadget