A game that works on OCS will work on ECS too. ECS is a big Win \o/.
Some badly coded games are incompatible with 1MB chipram tho. So u can use Degrader or other similar tool to disable the extra memory temporarily and get such a game working.
Some games are incompatible with extra floppy drives attached. So u can just use Degrader or other similar tool to disable the extra drives temporarily.
I used to hardcore test game compatiblity with a giant stack of different Amiga models and I kept a list of all the games and what their requirements were so when I had a game party I could quickly get any game in the universe working.
There are a few games which are tremendously badly coded and they just won't work on Kickstart 1.3, you MUST use Kickstart 1.2 on those few games. And there are a few others, mostly old EA games that require KS 1.1 (Arctic Fox, etc.)
There are probably at least 24 games that won't work on KS 2.0+ and MUST be started with KS1.3 but I did not really test for that. I was mainly testing 1.2 vs. 1.3,
512K chip vs 1MB or 2MB chip,
1 Floppy drive vs. 2 floppy drives,
PAL vs. NTSC. (huge numbers of games won't work in the wrong video mode)
Sometimes a game will work perfectly on your machine but then when u install a trainer suddenly the game has bizarre limitations (such as one of the things listed above). So u hafta watch out for "Virgin Game" vs. "Trained Game" differences.
There were also a couple of games that would not work if you had a modem plugged in. DOH!
