user_prompt: ## Instruction:
  You enter a main room that is separated from a side room by a shield wall. The side room cannot be easily reached, as it is separated by a water ditch.
  
  In the center of the room, there is a large floor button that deactivates the shield wall as long as it is pressed.
  
  Right next to the entrance door, a laser source is located. A laser slot on the opposite side of the room has two effects when activated: it starts a blue (pushing) gravitation beam and activates a blue path on the other side of the shield wall.
  
  In the side room, behind the shield wall, there is a ball machine that drops a ball from the ceiling onto a small platform. However, the ball will roll into the water and be destroyed if not picked up quickly.
  
  The exit door is marked with a blue person icon in the images. The goal is to open this door, which is activated by a ball slot on the ceiling.
  
  Select the correct options for each blank. Only output option letters one by one, with the format '{Option 1}{Option 2}{Option 3}{Option 4}{Option 5}, such as 'ABCDE'
  Step 1: ________
  Step 2: Walk through the blue portal to land on the elevated platform. From there, shoot an orange portal on the middle pillar on the opposite side of the blue portal to activate the laser slot.
  Step 3: ________
  Step 4: ________
  Step 5: ________
  Step 6: Ensure that the second cube is placed on top of the floor button to keep the shield wall deactivated.
  Step 7: Shoot a blue portal where the blue path hits the wall on the elevated platform to the left (from the entrance). Shoot an orange portal on the side of the pillar facing the side room.
  Step 8: Walk along the blue path into the side room to collect the ball being dropped from the ball machine, then walk back into the main room.
  Step 9: Walk through the orange portal with the ball and place it on the blue path where the elevated platform floor (a grid) is located.
  Step 10: Shoot a blue portal on the ground under the ball slot. Shoot an orange portal on the pillar wall facing the gravitation beam.
  Step 11: The ball will be carried by the beam that comes up vertically from the ground.
  Step 12: ________
  Step 13: Walk through the open exit door. Problem solved.
  
  Please select from the following candidate choices. Your response should end with "The final answer is [answer]." where the [answer] is the choice of options. 
  A. Remove the cube from the floor button to then walk over the blue path to the side room.
  B. Take both mirror cubes and redirect the laser around the pillar. The first cube should redirect the laser to the right side of the pillar, and the second cube should point the laser into the laser slot without requiring a portal.
  C. Move the ball from the yellow slot into the red slot, opening the purple room. Place the cube inside the cube slot in the purple room and exit.
  D. Walk along the blue path to fetch the mirror cube that is closer to the shield wall.
  E. Walk over the blue path to the side room.
  F. Take both mirror cubes and redirect the laser around the pillar. The first cube should redirect the laser to the left side of the pillar, and the second cube should point the laser into the laser slot without requiring a portal.
  G. This throws the player over into the second zone. From there, go through the shield wall where the button is. Shoot a portal next to the entrance and one in the wall next to the button.
  H. Walk along the blue path to fetch the mirror cube that is further from the shield wall.
  I. Enter the room. Shoot a blue portal on the white wall in the middle pillar of the room where the laser hits the wall. Shoot an orange portal on the elevated white wall piece on the left (from the entrance).
  J. Shoot a blue portal on the ground under the remaining mirror cube to make it drop onto the floor.