First, put ice under the trap door. Don't worry that the ice will still slip (this is for your head to push back, as shown in the picture, because the trap door is stuck and you can't get in).
Then you open the two trap doors in the first row so that you can go in, and then you can move.
Look, it won't get stuck.
Then finally leave two ice cubes and trap doors that are not on it (why do you want to leave them next time)
Then the length of ice cubes must be greater than or equal to 15.
Then the length of ice cubes must be greater than or equal to 15.
prepare
Crazy space
Here it comes. It's really six squares.