Cheats:

 To cheat with CyClones:

 All cheat codes are entered at the command line during startup.
 They must be preceded with 8335791.  e.g.:

    CYCLONES 8335791 [-D(E|M|H)] [-W(1-8)]
            [-L<Lvl#>] [<MapName>]
            [-A(1-3)] [-J]
            [startx starty] [startz]

    -D(E|M|H)    Set difficulty.
        -DE          Easy
        -DM          Medium
        -DH          Hard

    -W<#>    Start with weapons up to the number specified.  Stocked
             with full ammunition. (e.g. CYCLONES 8335791 -W3
             will provide weapons 1 through 3... the Gauss Pistol,
             the Chaingun, and the Alien Pistol)

    -L<#>    Start at level number (e.g. CYCLONES 8335791 -L5).
             This automatically starts player at starting location
             for that level.
             Levels 9, 17, 18, 20, and 24 are incomplete and are
             not visited during the course of the game.

    <MapName>  Specify a map by name (the .MAP files in the directory)
               Location defaults to (1,1).

    -A<#>    Start with armored suit/hand weapon 1-3 for the game.
             1=Sabre glove.  2=Saw glove.  3=Nano hand.

    -J       Start with the jump jet, with a huge charge on it.

    Examples:    CYCLONES 8335791 hive2 30 30
                 CYCLONES 8335791 -L4 -DE -W4 -A2

 Also, running CYCLONE 8335791 (no 'S') starts a SINGLE LEVEL
 immediately without the intro.  However, the game will quit at the
 end of the level.
 Cheat codes may be used as normal.

 From James Stringer <james@bupacm.demon.co.uk>