Add quick hints to explain key commands
A special mode (outside of tutorial) e.g. for the first 5-10 times for each command explaining in a very brief note what you could do next (e.g. <<"o"pen door>> when you bump into a door, <<"," to pick up items>> when you are standing on items, <<">" to enter location>> when you are standing on a special entry, etc.).
It simply should pop up in a corner of the screen for one turn without blocking anything. Basically a turbo tutorial mode.