Two paths across the lava lake in TNT level 30, Last Call:

                             |
------- End ---------------  |  ------- End ---------------
         |                   |           |
[ ] [ ] [N] [ ] [ ] [ ] [ ]  |  [ ] [ ] [G] [ ] [ ] [ ] [ ]
         |                   |         /
[K]-[L]-[M] [ ] [ ] [ ] [ ]  |  [ ] [F] [ ] [ ] [ ] [ ] [ ]
 |                           |         \
[J] [ ] [F]-[E]-[D] [ ] [ ]  |  [ ] [ ] [E]-[D]-[C] [ ] [ ]
 |       |       |           |                     \
[I]-[H]-[G] [ ] [C]-[B] [ ]  |  [ ] [ ] [ ] [ ] [ ] [B] [ ]
                     |       |                       |
    [ ]     [ ]     [A]      |      [ ]     [ ]     [A]
                     |       |                       |
------------------ Start --  |  ------------------ Start --
                             |
From Start:                  |  From Start:
North to red torch           |  North to red torch
North to green torch         |  North to green torch
West to green torch          |  Run Northwest to blue torch
North to blue torch          |  West to green torch
West to green torch          |  West to blue torch
West to blue torch           |  Run Northwest to blue torch
South to green torch         |  Run Northeast to blue torch
West to blue torch           |  North to End
West to green torch          |
North to green torch         |
North to red torch           |
East to blue torch           |
East to red torch            |
North to blue torch          |
North to End                 |
                             |
-----------------------------------------------------------
Notes: In the 2 illustrations above, each "[ ]" represents
one of the pedestals in the large rectangular lava lake at
the west end of the level.
The player first approaches this lava lake from the south.
"Torches" refer to the colored torches mounted upon the
pedestals.
While a player can simply Walk between horizontally- or
vertically-adjacent pedestals, it is recommended that you
Run when crossing diagonally between pedestals.  When doing
this, be sure to cross from corner to corner, where the
pedestals are closest together.
To read about and/or download a demo file which shows an
example of running across both paths, click here.