iGame won't run games on standard 1MB A600's or 2MB A1200's. There is a reason why it's not installed on the LITE, 68k and GAAE versions. It's very memory hungry launcher and you need every byte you can get on unexpanded Amiga's. Best to use the provided launchers (AGLaunch, List Launcher, Multiboot facilities and take a look at Tiny Launcher here on EAB).
How much RAM has the expanded A600 got? If it's not at least 4MB total, forget about iGame. Even with 2MB Amiga, you will struggle with some games but there are solutions to help. Many topics on EAB.
EDIT: Actually, iGame REQUIRES a 68020 at least as well as a decent amount of RAM!
As for the ClassicWB versions:
LITE has MUI installed already - it needs a 68020 and kickstart 3.0 or above (your A1200's)
1) You still need to make sure you have the correct MUI files and libs listed on the iGame homepage/readme:
http://winterland.no-ip.org/igame/files.html
They can be found on Aminet.
68k requires only a 68000 but also kickstart 3.0 or above and at least 2MB RAM (A600 with kickstart upgraded from 2.0 to 3.0/1 and mem expansion).
...and Won't run iGame - iGame needs a 68020 minimum.
GAAE works on an A600 with the standard kickstart 2.0 - even that however requires a mem upgrade to 2MB at least, 1MB won't cut it.
...and Won't run iGame - iGame needs a 68020 minimum.
You may want to look into Better Workbench also for your unexpanded Amiga's.
