The door has holes for three keys, two of which are hidden a bit more than the rest of the game’s items.
Hints: Backtracking is required to get through the door! Mind the time limit, though.
Look at the map for any places you may have missed!
Ogollo (the shopkeeper) has a required item at both of their stalls.
Solutions: (Paste this into a ROT13 translator, or download the walkthrough.txt file from the downloads section)
Gur svefg xrl vf va ebbz (2,5) oruvaq gur qbbe lbh jrera’g noyr gb bcra va gur obff ebbz (2,4). Btbyyb tvirf lbh gur xrl gb gung qbbe gur svefg gvzr lbh zrrg gurz.
Gur frpbaq xrl vf va gur ebbz jvgu gur guerr ybpxf (1,3). Lbh cvpx vg hc nhgbzngvpnyyl jura ragrevat gur ebbz. Vg’f nyfb gur xrl gb gur purfg Btbyyb unq ng gurve frpbaq fgnyy. Onpxgenpx gb ebbz (3,3) naq trg gur svany xrl!