There was an CDTV version of the game, maybe your copy is bases on that.
But normally the cracked versions have introscreen where you can turn on/off the cheats you want to have, but maybe this is not one of them..
Unfortunately the
www.back2roots.org website is down now. If it comes up again, I'll advise you to check there later for another .adf version.
But if you have a HD on the A1000, you can try this link for the WDHDLoad version of the game.
http://www.amiga.hu/amigos/ancientoys/gamefiles/whd/Lemmings.lzx
