× Eventually you'll need of all them, also because you'll need to drop red door. Also, closing again the big yellow door will prove useful towards the end.

× It's quite hard to reveal the route without spoiling all the solution but I can say that after the lemming stepped on (9,8) I had to use 4 tokens to let him go back.

× When I say go back I mean to yellow door, which reconnects to my first hint.

×For instance, if I'm not re-closing the door right away, as far as I can tell I need to use most of my rotations to get the lemming to go anywhere. And then I run out by the time I get the lemming past the door.

And I'm not sure if that's not what I'm supposed to do, or if it is but there's a more rotation-efficient way that I'm missing.

×green, red, green, green, lemming hits plate at 9,8

×green, red, red, red, lemming is going through lower left passage now

×Close the central plate, lemming is forced north

×red, red, green, now the red door now drops and the lemming is at 24,9