This is the solution to the sokoban puzzle in B11 in the post-game (expected level ~1,000).

If you wish to solve the whole floor in one go, you should prepare for about one whole hour of sokoban. The solution is non-trivial and I don't want to have to solve it again for NG+, hence this guide. Hopefully it'll help others as well.

---
Edit: I came back to this after a year and realized most of the diagrams showing the solutions are simply missing from Steam's servers. Googling for images missing from Steam guides reveals that the issue has been going on for years. I don't know what to call this other than gross technical incompetence. I don't have the originals anymore so I'm sorry I can't fix this.
---

You can't access this portion of the map until you've removed the red rock, which requires you to beat 3 of the bosses in 28F, 28F, or 250F of the Infinity Corridor.

First, this is the complete map of the floor to help you orient yourself:

Starting with the northern half of the puzzle, the objective is to clear the double red orbs in the middle so we can move the central orb to unblock the purple barrier.


1. First, fully explore this section, and then return with a fresh party because we can't leave until we solve the entire section, or our progress will be reset. Make sure you have 4 treasure keys on you.
2. Begin by moving the orbs marked by the green and yellow lines to their destinations.
3. The two central red obs are now removable, so remove them.
4. Move the central orb along the blue line and unlock the purple teleporter.


Now we need to grab the treasures. There are 5 orbs but 6 pads, and the important thing to notice from the pattern of the tracks is that once we move any orb to one of the two sets of pads, it's not possible to move it to the other set. This means if we left the dungeon now, we need to solve it two more times. This game is evil.

So let's save some time and solve one of the pairs now. Move the orbs along the colored lines to unlock the first treasure box. Green, yellow, then blue. We get a Platinum Yendorian Express Card for our trouble.

Now leave and re-enter the dungeon. From the initial state, do the following for the last treasure box in this section. Again, green, yellow, and then finally blue. This box contains a Scourge.


Now go through the purple barrier that we've unlocked before, take the teleporter, and unlock the shortcut + warp point nearby. Leave and return to the dungeon.

1. Fully explore this part and then return with a fresh party.
2. We'll grab the treasures first. Push the orbs along the colored lines: Green, yellow, then blue.
3. We get an Elixir of Life from the treasure box. Now we need to unlock the other pair.


Now push one of the orbs from the complete pair to the other side, for a BFG 9000.

Now move all 5 orbs to the central cluster of pads and deactivate the purple barrier.

Now go through the purple barrier, take the teleporter, and unlock the shortcut nearby. Leave and return to the dungeon.

Now for the last section.

Let's start with the north-west part of the puzzle. To get there, take the teleporter north of the warp point. First, push these three orbs marked in green:

---

Now push the green orbs into position, and finally the one marked yellow. Now activate the red orb nearby and push the orb next to it onto the closest center panel:

---

Now for the north-east portion. Start by pushing the orbs. Green, yellow, then blue. This is so we can move freely around this section.

---

Now push this orb labeled in green to the spot on the row without a pad:

---

And then these two orbs, first green, then yellow:

---

And then finally, green, yellow, and blue. Touch the red orb and push the orb next to it to the closest center panel.

---

Now touch the northern red orb at the center, to unlock the purple barrier. You can leave and re-enter the dungeon now if you wish.

Now for the southern half. Take the teleporter south of the warp point.

Start by pushing the green orb out of the way. Don't push it onto the pad. Then push the yellow and blue orbs as indicated.

---

Now push the green orb back to where it was, and then finally the yellow orb onto the last pad. Touch the red orb and push the green orb to the closest center panel.

---

Now for the last part of the puzzle. Start by pushing the orbs marked onto a row of pads. Start with the green one, then the yellow one, and then the blue one, following the path already taken by the green one. They should be next to each other.

---

Now push the following orbs. Green, yellow, blue, then finally the one marked brown.

---

Now touch the red orb and push the adjacent orb onto the nearest center pad. Remove the southern red orb in the central area, unlock the last barrier, and follow the path to the last room. This switch unlocks a rock on 30F.

Here's the complete map again:

---

Congratulations on finishing the deepest level of the labyrinth!