1. Cheat
2. Programming

1. Cheat:

     Type  [IEHOVAH] on the title screen and you can press [L] to skip
levels and [1] and [2] to go to the halfway points of each level.

2. Programming:

     Use a Hex editor to edit the file INDY.COM and find the following
bytes. Change the byte in square brackets:

For infinite lives:

Change:                         To:
08 3E F0 03 00 [74 03]          90 90
[E8 15 4A]                      90 90 90
[E8 1D 4C]                      90 90 90

For infinite energy:

Change:                         To:
[28] 06 EF 03                   CF
BF 26 04 80 7D 0A FE [72 01]    90 90