Free Hero Mesh

  so automatically once the level is saved, if any changes have been made
  which might invalidate the solution (although it doesn't know for sure,
  so there are false positives). However, you can set this deliberately by
  yourself, in case you know that the solution remains valid; if you do
  set it by yourself just before saving, it will use your value rather
  than setting it automatically.

'mm' <class> <image> <misc1> <misc2> <misc3> <dir>
  Modify a MRU. Any values specified as null means no change.

'mR' <number>
  Select a relative MRU. Negative numbers move up the list, and positive
  numbers move down the list.

'mr' <number>
  Select a MRU, given the MRU number (0 to 31; the top is zero).

?.editClick.ctrl.left: select 'em',id from objects where x=$X and y=$Y and up is null;
?.editClick.alt.left: ^u
?.editClick.right: delete from objects where x=$X and y=$Y and up is null;
?.editClick.ctrl.right: select 'am',class,image,misc1,misc2,misc3,dir from objects where x=$X and y=$Y and up is null;
?.editClick.shift.left: ^<
?.editClick.shift.middle: values('^Z',null),('^<',xy($X,$Y));
?.editClick.shift.right: ^>
?.editClick.alt.middle: select 'mm',null,null,null,$X,$Y,null;

! Global key bindings
?.?.kp_minus: select 'go',-(level()-1) where level()>1;
?.?.kp_plus: select 'go',-(level()+1) where level()<max_level();
?.?.shift.kp_minus: select 'go',-1;
?.?.shift.kp_plus: select 'go',-max_level();
?.?.ctrl.G: select 'go',-:Go_To_Level where :Go_To_Level=cast(:Go_To_Level as int) and cast(:Go_To_Level as int)>0;

      if(!level_title) fatal("Allocation failed\n");
      return 0;
    case 'lv': // Set level version
      discard_solution();
      level_version=number;
      level_changed=0;
      return 0;
    case 'mm': // Modify MRU
      if(curmru>=MRUCOUNT) return prev;
      if(argc>1 && sqlite3_column_type(args,1)!=SQLITE_NULL) {
        x=sqlite3_column_int(args,1)&0x3FFF;
        if(x) mru[curmru].class=x;
      }
      if(argc>2 && sqlite3_column_type(args,2)!=SQLITE_NULL) mru[curmru].img=sqlite3_column_int(args,2)&0xFF;
      if(argc>3 && sqlite3_column_type(args,3)!=SQLITE_NULL) mru[curmru].misc1=UVALUE(sqlite3_column_int64(args,3),sqlite3_column_int64(args,3)>>32);
      if(argc>4 && sqlite3_column_type(args,4)!=SQLITE_NULL) mru[curmru].misc2=UVALUE(sqlite3_column_int64(args,4),sqlite3_column_int64(args,4)>>32);
      if(argc>5 && sqlite3_column_type(args,5)!=SQLITE_NULL) mru[curmru].misc3=UVALUE(sqlite3_column_int64(args,5),sqlite3_column_int64(args,5)>>32);
      if(argc>6 && sqlite3_column_type(args,6)!=SQLITE_NULL) mru[curmru].dir=sqlite3_column_int64(args,6)&7;
      return prev;
    case 'mR': // Select MRU relative
      number+=curmru;
      // fall through
    case 'mr': // Select MRU absolute
      if(number>=0 && number<MRUCOUNT) curmru=number;
      return 0;
    case 're': // Resize and clear

Mouse (in grid):

  LEFT          Add object
  CTRL+LEFT     Edit Misc/Dir of object
  ALT+LEFT      Add object (allow duplicate)
  SHIFT+LEFT    Set top corner of selection rectangle
  ALT+MIDDLE    Set Misc2/Misc3 of MRU to X/Y
  SHIFT+MIDDLE  Make 1x1 selection rectangle
  RIGHT         Delete object
  CTRL+RIGHT    Copy object to MRU
  SHIFT+RIGHT   Set bottom corner of selection rectangle