I need to get to "DO WANT!" (the only passkey/collectible I am still missing!) I'm at the endgame, so I can't go topside right because that triggers final boss fight.
Wall is blocked off naturally between Points 1 and 2, so no way through there.
Door at Point 3 is sealed shut! So there is no way of getting from left of 1-2-3 to right of 1-2-3! (OR IS THERE???)