Mac users stress no more!
Torrent a horse called bear full. You'll need FS-UAE to run Amiga software on your Mac, along with Amiga kickstart files. (These can be bought, fully legally, from Amiga Forever.) 1.3 is a good bet for games. Like many emulators, OpenEmu allows the use of cheat codes to change the way a game plays (invincibility, level skipping, etc.). Cheat-code support in OpenEmu is determined by each core and its underlying emulation code. Some cores do not support cheat codes; OpenEmu knows which cores those are, and its cheat functionality will not be available when they are in use.