CITADEL 2
Solutionget red/green key from 5, -4 (rgkey)
open door at 6,1; get oxygen and ?key-half from catacombs (oxygen)
drop ?key-half at oil-can location (); open barbican (-2,0) (oil)
collect green/white key from near well; open same door (gwkey)
collect apple; drop oxygen at 7,0; collect red/white key from 7,0 (apple)
use key in mines (-5,1); collect green/red key from -4,1; use g/r key at 6,-1; drop apple at 7,-4 (grkey)
collect g/y key (top of chimney); collect g/b key (1,0); open door at a,0; open door at b,0 (gykey)
collect magenta/blue key (3,3); collect cog-wheel from 0,0; fix winch at 2,-3; collect bird at -1,-5; collect box thing at 2,-4 (mbkey)
drop bird at 7,0; collect oxygen from 7.0; drop box (bullets) at 1,0; collect pipe at -3,2; drop oxygen at -3,-1; collect green/cyan key from -3,-1; drop pipe at 7,-4; collect apple; use key at 8,-4 (pipe)
drop apple at 8,-5; collect smoker from 8,-7 (and scroll from room above); retrieve apple (etower)
drop apple at 7,0; collect bird; smoke bee at d,0; jump to use bird at f,-2 (bee)
collect bgkey from e,-5; collect axe from e,0; use key at 0,0; use axe at -6,3 (bgkey)
collect y/b key from -5,4; drop y/b key at 0,0; collect r/y key from 5,-2; use r/y key at 0,-2; collect barrel from 1,-2; collect y/m key from -1,-3 (ybkey)
drop y/m key at 1,-1; get mirror (walk through wall from -1,-1); drop barrel at -1,-9; get rm key from -1,-a (wtower)
collect wc key from 3,-1; drop mirror at 3,-1; open door at g,0; open door at g,-3 (wc key)
collect gun from h,0; collect bullets from 1,0 (gun)
shoot guards at -5,2 and -5,3; collect oxygen from -3,-1; shoot guards at 9,3; 6,2 and b,-2 (guards)
drop gun at 5,-4; collect key-half at 7,-3; drop oxygen at 5,-1; collect key-half at 5,-1; use key at -9,-2 (have to have two halves in correct order (atic)
collect tap and axe from mines; drop tap at 5,0; collect scissors; go to clock and use scissors; collect weight; use weight at f,-5; collect crystal at f,-4 (axe)
drop crystal at 5,-4; collect gun; drop axe at -1,-5; shoot guards at -1,-9 and 0,-9; collect crystal at 3,-4 (access via chimey); drop crystal at 0,0; collect y/b key; drop gun at 1,-1; collect ym key; open my door; collect axe; open door with y/b key; use axe at 0,-a (tow)
collect crystal at 0,-b; collect barrel; drop barrel at 0,0; collect crystal at 0,0; deliver the two crystals to -8,-1; collect tap from 5,0 and oxygen from 5,-1; drop tap at 7,0; collect apple; drop apple at 6,2; collect tap from 6,2; drop oxygen at 7,0; collect other tap; use taps at 5,3 and 6,3 (taps)
collect barrel from 0,0; collect glove; drop barrel at 7,0; collect oxygen; collect skull at a,3 (glove)
drop oxygen at 7,0; collect barrel; neutalise acid at 7,3; drop barrel at 7,3; collect b/w key; collect crystal at 5,-4; open door and collect crystal at -6,1; drop crystals at -8,-1 (pit)
collect gun; shoot guard and collect crystal at 7,5 (access via 7,3); drop crystal at -8,-1 (end)
Solution by Bert Molemangler
http://www.stairwaytohell.com