Their Finest Hour   by The Underground Council (UGC)

----------- Cracked by Black Star and Sam Brown Many thanks to Warlord and Malignant Growth (SysOps of Fungus Land) for supplying us this game! Well, this one LOOKED difficult, but once we got started in it, it was pretty straighforward. The game requires that you "tune" your radio to a specific three digit number -- and each digit can be red, white, or blue. Pretty nasty doc check. Anyway, I loaded up the BOB.EXE file into EMS (using Turbo Debugger 386) and executed it. I have TD set so the Alt-SysRq key is an unconditional break at the current CS:IP. I executed until I hit the doc check window and Alt-SysRq'd. Then, I traced through the routines until I found a RET or RETF. Actually, this is intuitive -- a combination of paging down the through the code and tracing. When you break, you're usually in a mouse/keyboard/video routine, very low level, and have to trace up to the calling routine. This one required 12 traces to get to what looked like a nice high level. Anyway, you write all these addresses down where the calls originate. Then step over the calls -- see what each one does. Find the one that pulls up the doc check window and look at what memory bytes it changes in the global data area (usually DS). Then check for compares against that address and reverse the subsequent branch -- eg, JNE to JE. Killed the routine that pulls up the window and played it. It still says "Tune your radio!" but it no longer pulls up the window or restricts any flying function. Hmm... Sam checked and found another flag and showed me the instruction to reverse. Tryed it and it worked perfectly. Modified some of the text in the program to brag a bit, tested the thing for about 3-4 hours, and wrote this text file. Black Star